{
  "cells": [
    {
      "cell_type": "code",
      "execution_count": 1,
      "id": "a26e3a59",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "a26e3a59",
        "outputId": "71925154-b304-4cf0-9886-1e220a6ef549"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m10.4/10.4 MB\u001b[0m \u001b[31m18.1 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m260.7/260.7 kB\u001b[0m \u001b[31m3.1 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m1.3/1.3 MB\u001b[0m \u001b[31m21.3 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m3.1/3.1 MB\u001b[0m \u001b[31m16.0 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[?25h"
          ]
        }
      ],
      "source": [
        "# Install the necessary libraries for audio processing and model fine-tuning\n",
        "!pip install transformers librosa soundfile jiwer pyctcdecode rapidfuzz pygtrie --upgrade --force-reinstall --no-deps --quiet\n"
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "# Install the HuggingFace evaluate metric library (and jiwer fallback)\n",
        "!pip install --quiet evaluate jiwer\n"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "06s8SRNqgWEN",
        "outputId": "0bbd6eb2-8ead-4d52-d3a4-338ca0ab2cac"
      },
      "id": "06s8SRNqgWEN",
      "execution_count": 17,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "\u001b[?25l   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m0.0/84.0 kB\u001b[0m \u001b[31m?\u001b[0m eta \u001b[36m-:--:--\u001b[0m\r\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m84.0/84.0 kB\u001b[0m \u001b[31m3.1 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[?25h\u001b[?25l   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m0.0/491.4 kB\u001b[0m \u001b[31m?\u001b[0m eta \u001b[36m-:--:--\u001b[0m\r\u001b[2K   \u001b[91m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m\u001b[90m╺\u001b[0m \u001b[32m481.3/491.4 kB\u001b[0m \u001b[31m17.3 MB/s\u001b[0m eta \u001b[36m0:00:01\u001b[0m\r\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m491.4/491.4 kB\u001b[0m \u001b[31m10.8 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m116.3/116.3 kB\u001b[0m \u001b[31m8.3 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m193.6/193.6 kB\u001b[0m \u001b[31m13.5 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m143.5/143.5 kB\u001b[0m \u001b[31m9.4 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[2K   \u001b[90m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\u001b[0m \u001b[32m194.8/194.8 kB\u001b[0m \u001b[31m13.6 MB/s\u001b[0m eta \u001b[36m0:00:00\u001b[0m\n",
            "\u001b[?25h\u001b[31mERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.\n",
            "torch 2.6.0+cu124 requires nvidia-cublas-cu12==12.4.5.8; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-cublas-cu12 12.5.3.2 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-cuda-cupti-cu12==12.4.127; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-cuda-cupti-cu12 12.5.82 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-cuda-nvrtc-cu12==12.4.127; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-cuda-nvrtc-cu12 12.5.82 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-cuda-runtime-cu12==12.4.127; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-cuda-runtime-cu12 12.5.82 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-cudnn-cu12==9.1.0.70; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-cudnn-cu12 9.3.0.75 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-cufft-cu12==11.2.1.3; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-cufft-cu12 11.2.3.61 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-curand-cu12==10.3.5.147; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-curand-cu12 10.3.6.82 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-cusolver-cu12==11.6.1.9; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-cusolver-cu12 11.6.3.83 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-cusparse-cu12==12.3.1.170; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-cusparse-cu12 12.5.1.3 which is incompatible.\n",
            "torch 2.6.0+cu124 requires nvidia-nvjitlink-cu12==12.4.127; platform_system == \"Linux\" and platform_machine == \"x86_64\", but you have nvidia-nvjitlink-cu12 12.5.82 which is incompatible.\n",
            "gcsfs 2025.3.2 requires fsspec==2025.3.2, but you have fsspec 2025.3.0 which is incompatible.\u001b[0m\u001b[31m\n",
            "\u001b[0m"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 18,
      "id": "99ffde90",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 49,
          "referenced_widgets": [
            "027bbe2d071142b8afc9e67e4719b822",
            "0f1a2e43e1cd45208ef9ed27d861a407",
            "182799afc826473c8bdf83c48c2eb5f4",
            "0237e16e78db4dfbb66acf13f7ce4c55",
            "527957fe608a487c97e0928584171982",
            "e98b82cc03524f97a60bbf4373e4be0f",
            "f9c166381f5e46e2ba97be00cc012302",
            "8f3c5c71f2164ec9a16ca9472dc9db28",
            "f952fce0aa5048c0aad8e84e02a915e3",
            "533ac0ef05dc432da4b17676b5a4b585",
            "71ed383a6f6f4a2e818b1b975ec24060"
          ]
        },
        "id": "99ffde90",
        "outputId": "d0d77b1a-fa51-417f-f34c-08d58f1cd8c5"
      },
      "outputs": [
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "Downloading builder script:   0%|          | 0.00/4.49k [00:00<?, ?B/s]"
            ],
            "application/vnd.jupyter.widget-view+json": {
              "version_major": 2,
              "version_minor": 0,
              "model_id": "027bbe2d071142b8afc9e67e4719b822"
            }
          },
          "metadata": {}
        }
      ],
      "source": [
        "# Import required modules and disable Weights & Biases logging for a cleaner run\n",
        "import os\n",
        "import pandas as pd\n",
        "import numpy as np\n",
        "import torch\n",
        "import librosa\n",
        "import evaluate\n",
        "wer_metric = evaluate.load(\"wer\")\n",
        "from jiwer import wer\n",
        "from torch.utils.data import Dataset\n",
        "from transformers import AutoProcessor, AutoModelForCTC, TrainingArguments, Trainer\n",
        "from pyctcdecode import build_ctcdecoder\n",
        "\n",
        "os.environ[\"WANDB_DISABLED\"] = \"true\"  # Disable W&B to prevent login prompts\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 3,
      "id": "f91c339d",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 108
        },
        "id": "f91c339d",
        "outputId": "685804bf-0e51-4f05-e7ed-a7442cb0513e"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Please upload your audio ZIP file:\n"
          ]
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "<IPython.core.display.HTML object>"
            ],
            "text/html": [
              "\n",
              "     <input type=\"file\" id=\"files-3552f718-68d3-4ebc-bfc4-b92c3dfe14a7\" name=\"files[]\" multiple disabled\n",
              "        style=\"border:none\" />\n",
              "     <output id=\"result-3552f718-68d3-4ebc-bfc4-b92c3dfe14a7\">\n",
              "      Upload widget is only available when the cell has been executed in the\n",
              "      current browser session. Please rerun this cell to enable.\n",
              "      </output>\n",
              "      <script>// Copyright 2017 Google LLC\n",
              "//\n",
              "// Licensed under the Apache License, Version 2.0 (the \"License\");\n",
              "// you may not use this file except in compliance with the License.\n",
              "// You may obtain a copy of the License at\n",
              "//\n",
              "//      http://www.apache.org/licenses/LICENSE-2.0\n",
              "//\n",
              "// Unless required by applicable law or agreed to in writing, software\n",
              "// distributed under the License is distributed on an \"AS IS\" BASIS,\n",
              "// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n",
              "// See the License for the specific language governing permissions and\n",
              "// limitations under the License.\n",
              "\n",
              "/**\n",
              " * @fileoverview Helpers for google.colab Python module.\n",
              " */\n",
              "(function(scope) {\n",
              "function span(text, styleAttributes = {}) {\n",
              "  const element = document.createElement('span');\n",
              "  element.textContent = text;\n",
              "  for (const key of Object.keys(styleAttributes)) {\n",
              "    element.style[key] = styleAttributes[key];\n",
              "  }\n",
              "  return element;\n",
              "}\n",
              "\n",
              "// Max number of bytes which will be uploaded at a time.\n",
              "const MAX_PAYLOAD_SIZE = 100 * 1024;\n",
              "\n",
              "function _uploadFiles(inputId, outputId) {\n",
              "  const steps = uploadFilesStep(inputId, outputId);\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  // Cache steps on the outputElement to make it available for the next call\n",
              "  // to uploadFilesContinue from Python.\n",
              "  outputElement.steps = steps;\n",
              "\n",
              "  return _uploadFilesContinue(outputId);\n",
              "}\n",
              "\n",
              "// This is roughly an async generator (not supported in the browser yet),\n",
              "// where there are multiple asynchronous steps and the Python side is going\n",
              "// to poll for completion of each step.\n",
              "// This uses a Promise to block the python side on completion of each step,\n",
              "// then passes the result of the previous step as the input to the next step.\n",
              "function _uploadFilesContinue(outputId) {\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  const steps = outputElement.steps;\n",
              "\n",
              "  const next = steps.next(outputElement.lastPromiseValue);\n",
              "  return Promise.resolve(next.value.promise).then((value) => {\n",
              "    // Cache the last promise value to make it available to the next\n",
              "    // step of the generator.\n",
              "    outputElement.lastPromiseValue = value;\n",
              "    return next.value.response;\n",
              "  });\n",
              "}\n",
              "\n",
              "/**\n",
              " * Generator function which is called between each async step of the upload\n",
              " * process.\n",
              " * @param {string} inputId Element ID of the input file picker element.\n",
              " * @param {string} outputId Element ID of the output display.\n",
              " * @return {!Iterable<!Object>} Iterable of next steps.\n",
              " */\n",
              "function* uploadFilesStep(inputId, outputId) {\n",
              "  const inputElement = document.getElementById(inputId);\n",
              "  inputElement.disabled = false;\n",
              "\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  outputElement.innerHTML = '';\n",
              "\n",
              "  const pickedPromise = new Promise((resolve) => {\n",
              "    inputElement.addEventListener('change', (e) => {\n",
              "      resolve(e.target.files);\n",
              "    });\n",
              "  });\n",
              "\n",
              "  const cancel = document.createElement('button');\n",
              "  inputElement.parentElement.appendChild(cancel);\n",
              "  cancel.textContent = 'Cancel upload';\n",
              "  const cancelPromise = new Promise((resolve) => {\n",
              "    cancel.onclick = () => {\n",
              "      resolve(null);\n",
              "    };\n",
              "  });\n",
              "\n",
              "  // Wait for the user to pick the files.\n",
              "  const files = yield {\n",
              "    promise: Promise.race([pickedPromise, cancelPromise]),\n",
              "    response: {\n",
              "      action: 'starting',\n",
              "    }\n",
              "  };\n",
              "\n",
              "  cancel.remove();\n",
              "\n",
              "  // Disable the input element since further picks are not allowed.\n",
              "  inputElement.disabled = true;\n",
              "\n",
              "  if (!files) {\n",
              "    return {\n",
              "      response: {\n",
              "        action: 'complete',\n",
              "      }\n",
              "    };\n",
              "  }\n",
              "\n",
              "  for (const file of files) {\n",
              "    const li = document.createElement('li');\n",
              "    li.append(span(file.name, {fontWeight: 'bold'}));\n",
              "    li.append(span(\n",
              "        `(${file.type || 'n/a'}) - ${file.size} bytes, ` +\n",
              "        `last modified: ${\n",
              "            file.lastModifiedDate ? file.lastModifiedDate.toLocaleDateString() :\n",
              "                                    'n/a'} - `));\n",
              "    const percent = span('0% done');\n",
              "    li.appendChild(percent);\n",
              "\n",
              "    outputElement.appendChild(li);\n",
              "\n",
              "    const fileDataPromise = new Promise((resolve) => {\n",
              "      const reader = new FileReader();\n",
              "      reader.onload = (e) => {\n",
              "        resolve(e.target.result);\n",
              "      };\n",
              "      reader.readAsArrayBuffer(file);\n",
              "    });\n",
              "    // Wait for the data to be ready.\n",
              "    let fileData = yield {\n",
              "      promise: fileDataPromise,\n",
              "      response: {\n",
              "        action: 'continue',\n",
              "      }\n",
              "    };\n",
              "\n",
              "    // Use a chunked sending to avoid message size limits. See b/62115660.\n",
              "    let position = 0;\n",
              "    do {\n",
              "      const length = Math.min(fileData.byteLength - position, MAX_PAYLOAD_SIZE);\n",
              "      const chunk = new Uint8Array(fileData, position, length);\n",
              "      position += length;\n",
              "\n",
              "      const base64 = btoa(String.fromCharCode.apply(null, chunk));\n",
              "      yield {\n",
              "        response: {\n",
              "          action: 'append',\n",
              "          file: file.name,\n",
              "          data: base64,\n",
              "        },\n",
              "      };\n",
              "\n",
              "      let percentDone = fileData.byteLength === 0 ?\n",
              "          100 :\n",
              "          Math.round((position / fileData.byteLength) * 100);\n",
              "      percent.textContent = `${percentDone}% done`;\n",
              "\n",
              "    } while (position < fileData.byteLength);\n",
              "  }\n",
              "\n",
              "  // All done.\n",
              "  yield {\n",
              "    response: {\n",
              "      action: 'complete',\n",
              "    }\n",
              "  };\n",
              "}\n",
              "\n",
              "scope.google = scope.google || {};\n",
              "scope.google.colab = scope.google.colab || {};\n",
              "scope.google.colab._files = {\n",
              "  _uploadFiles,\n",
              "  _uploadFilesContinue,\n",
              "};\n",
              "})(self);\n",
              "</script> "
            ]
          },
          "metadata": {}
        },
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Saving audio.zip to audio.zip\n",
            "Audio files extracted to /content/audio_files\n"
          ]
        }
      ],
      "source": [
        "# Prompt the user to upload a ZIP file containing audio recordings\n",
        "from google.colab import files\n",
        "import zipfile\n",
        "\n",
        "print(\"Please upload your audio ZIP file:\")\n",
        "uploaded = files.upload()  # User selects the ZIP archive\n",
        "\n",
        "# Extract all audio files to a designated directory\n",
        "zip_name = next(iter(uploaded))\n",
        "with zipfile.ZipFile(zip_name, 'r') as archive:\n",
        "    archive.extractall(\"/content/audio_files\")\n",
        "print(\"Audio files extracted to /content/audio_files\")\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 4,
      "id": "43d90872",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 108
        },
        "id": "43d90872",
        "outputId": "95e4f5b7-6308-4890-abcb-1fb861d419c6"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Please upload your speech_dataset.csv file:\n"
          ]
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "<IPython.core.display.HTML object>"
            ],
            "text/html": [
              "\n",
              "     <input type=\"file\" id=\"files-662a2e89-f2db-4d08-97dd-11b8be8bdbdc\" name=\"files[]\" multiple disabled\n",
              "        style=\"border:none\" />\n",
              "     <output id=\"result-662a2e89-f2db-4d08-97dd-11b8be8bdbdc\">\n",
              "      Upload widget is only available when the cell has been executed in the\n",
              "      current browser session. Please rerun this cell to enable.\n",
              "      </output>\n",
              "      <script>// Copyright 2017 Google LLC\n",
              "//\n",
              "// Licensed under the Apache License, Version 2.0 (the \"License\");\n",
              "// you may not use this file except in compliance with the License.\n",
              "// You may obtain a copy of the License at\n",
              "//\n",
              "//      http://www.apache.org/licenses/LICENSE-2.0\n",
              "//\n",
              "// Unless required by applicable law or agreed to in writing, software\n",
              "// distributed under the License is distributed on an \"AS IS\" BASIS,\n",
              "// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n",
              "// See the License for the specific language governing permissions and\n",
              "// limitations under the License.\n",
              "\n",
              "/**\n",
              " * @fileoverview Helpers for google.colab Python module.\n",
              " */\n",
              "(function(scope) {\n",
              "function span(text, styleAttributes = {}) {\n",
              "  const element = document.createElement('span');\n",
              "  element.textContent = text;\n",
              "  for (const key of Object.keys(styleAttributes)) {\n",
              "    element.style[key] = styleAttributes[key];\n",
              "  }\n",
              "  return element;\n",
              "}\n",
              "\n",
              "// Max number of bytes which will be uploaded at a time.\n",
              "const MAX_PAYLOAD_SIZE = 100 * 1024;\n",
              "\n",
              "function _uploadFiles(inputId, outputId) {\n",
              "  const steps = uploadFilesStep(inputId, outputId);\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  // Cache steps on the outputElement to make it available for the next call\n",
              "  // to uploadFilesContinue from Python.\n",
              "  outputElement.steps = steps;\n",
              "\n",
              "  return _uploadFilesContinue(outputId);\n",
              "}\n",
              "\n",
              "// This is roughly an async generator (not supported in the browser yet),\n",
              "// where there are multiple asynchronous steps and the Python side is going\n",
              "// to poll for completion of each step.\n",
              "// This uses a Promise to block the python side on completion of each step,\n",
              "// then passes the result of the previous step as the input to the next step.\n",
              "function _uploadFilesContinue(outputId) {\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  const steps = outputElement.steps;\n",
              "\n",
              "  const next = steps.next(outputElement.lastPromiseValue);\n",
              "  return Promise.resolve(next.value.promise).then((value) => {\n",
              "    // Cache the last promise value to make it available to the next\n",
              "    // step of the generator.\n",
              "    outputElement.lastPromiseValue = value;\n",
              "    return next.value.response;\n",
              "  });\n",
              "}\n",
              "\n",
              "/**\n",
              " * Generator function which is called between each async step of the upload\n",
              " * process.\n",
              " * @param {string} inputId Element ID of the input file picker element.\n",
              " * @param {string} outputId Element ID of the output display.\n",
              " * @return {!Iterable<!Object>} Iterable of next steps.\n",
              " */\n",
              "function* uploadFilesStep(inputId, outputId) {\n",
              "  const inputElement = document.getElementById(inputId);\n",
              "  inputElement.disabled = false;\n",
              "\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  outputElement.innerHTML = '';\n",
              "\n",
              "  const pickedPromise = new Promise((resolve) => {\n",
              "    inputElement.addEventListener('change', (e) => {\n",
              "      resolve(e.target.files);\n",
              "    });\n",
              "  });\n",
              "\n",
              "  const cancel = document.createElement('button');\n",
              "  inputElement.parentElement.appendChild(cancel);\n",
              "  cancel.textContent = 'Cancel upload';\n",
              "  const cancelPromise = new Promise((resolve) => {\n",
              "    cancel.onclick = () => {\n",
              "      resolve(null);\n",
              "    };\n",
              "  });\n",
              "\n",
              "  // Wait for the user to pick the files.\n",
              "  const files = yield {\n",
              "    promise: Promise.race([pickedPromise, cancelPromise]),\n",
              "    response: {\n",
              "      action: 'starting',\n",
              "    }\n",
              "  };\n",
              "\n",
              "  cancel.remove();\n",
              "\n",
              "  // Disable the input element since further picks are not allowed.\n",
              "  inputElement.disabled = true;\n",
              "\n",
              "  if (!files) {\n",
              "    return {\n",
              "      response: {\n",
              "        action: 'complete',\n",
              "      }\n",
              "    };\n",
              "  }\n",
              "\n",
              "  for (const file of files) {\n",
              "    const li = document.createElement('li');\n",
              "    li.append(span(file.name, {fontWeight: 'bold'}));\n",
              "    li.append(span(\n",
              "        `(${file.type || 'n/a'}) - ${file.size} bytes, ` +\n",
              "        `last modified: ${\n",
              "            file.lastModifiedDate ? file.lastModifiedDate.toLocaleDateString() :\n",
              "                                    'n/a'} - `));\n",
              "    const percent = span('0% done');\n",
              "    li.appendChild(percent);\n",
              "\n",
              "    outputElement.appendChild(li);\n",
              "\n",
              "    const fileDataPromise = new Promise((resolve) => {\n",
              "      const reader = new FileReader();\n",
              "      reader.onload = (e) => {\n",
              "        resolve(e.target.result);\n",
              "      };\n",
              "      reader.readAsArrayBuffer(file);\n",
              "    });\n",
              "    // Wait for the data to be ready.\n",
              "    let fileData = yield {\n",
              "      promise: fileDataPromise,\n",
              "      response: {\n",
              "        action: 'continue',\n",
              "      }\n",
              "    };\n",
              "\n",
              "    // Use a chunked sending to avoid message size limits. See b/62115660.\n",
              "    let position = 0;\n",
              "    do {\n",
              "      const length = Math.min(fileData.byteLength - position, MAX_PAYLOAD_SIZE);\n",
              "      const chunk = new Uint8Array(fileData, position, length);\n",
              "      position += length;\n",
              "\n",
              "      const base64 = btoa(String.fromCharCode.apply(null, chunk));\n",
              "      yield {\n",
              "        response: {\n",
              "          action: 'append',\n",
              "          file: file.name,\n",
              "          data: base64,\n",
              "        },\n",
              "      };\n",
              "\n",
              "      let percentDone = fileData.byteLength === 0 ?\n",
              "          100 :\n",
              "          Math.round((position / fileData.byteLength) * 100);\n",
              "      percent.textContent = `${percentDone}% done`;\n",
              "\n",
              "    } while (position < fileData.byteLength);\n",
              "  }\n",
              "\n",
              "  // All done.\n",
              "  yield {\n",
              "    response: {\n",
              "      action: 'complete',\n",
              "    }\n",
              "  };\n",
              "}\n",
              "\n",
              "scope.google = scope.google || {};\n",
              "scope.google.colab = scope.google.colab || {};\n",
              "scope.google.colab._files = {\n",
              "  _uploadFiles,\n",
              "  _uploadFilesContinue,\n",
              "};\n",
              "})(self);\n",
              "</script> "
            ]
          },
          "metadata": {}
        },
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Saving speech_dataset.csv to speech_dataset.csv\n",
            "Loaded 49 entries from the dataset\n"
          ]
        }
      ],
      "source": [
        "# Prompt the user to upload the CSV file containing 'path' and 'text' columns\n",
        "print(\"Please upload your speech_dataset.csv file:\")\n",
        "uploaded = files.upload()\n",
        "\n",
        "# Load the CSV into a pandas DataFrame for further processing\n",
        "df = pd.read_csv(\"speech_dataset.csv\", encoding=\"latin1\")\n",
        "print(f\"Loaded {len(df)} entries from the dataset\")\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 5,
      "id": "4e4e34f7",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 452,
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        },
        "id": "4e4e34f7",
        "outputId": "0b3a1308-7d4f-4c64-f96d-38033fd6b022"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stderr",
          "text": [
            "/usr/local/lib/python3.11/dist-packages/huggingface_hub/utils/_auth.py:94: UserWarning: \n",
            "The secret `HF_TOKEN` does not exist in your Colab secrets.\n",
            "To authenticate with the Hugging Face Hub, create a token in your settings tab (https://huggingface.co/settings/tokens), set it as secret in your Google Colab and restart your session.\n",
            "You will be able to reuse this secret in all of your notebooks.\n",
            "Please note that authentication is recommended but still optional to access public models or datasets.\n",
            "  warnings.warn(\n"
          ]
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "preprocessor_config.json:   0%|          | 0.00/159 [00:00<?, ?B/s]"
            ],
            "application/vnd.jupyter.widget-view+json": {
              "version_major": 2,
              "version_minor": 0,
              "model_id": "8d88f9d2a38049b4be0a9fba5f64350f"
            }
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "tokenizer_config.json:   0%|          | 0.00/163 [00:00<?, ?B/s]"
            ],
            "application/vnd.jupyter.widget-view+json": {
              "version_major": 2,
              "version_minor": 0,
              "model_id": "0e779b8b184c4ece8fded2700543c175"
            }
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "config.json:   0%|          | 0.00/1.84k [00:00<?, ?B/s]"
            ],
            "application/vnd.jupyter.widget-view+json": {
              "version_major": 2,
              "version_minor": 0,
              "model_id": "13b12586377e43c0a800902e2fc5a1d3"
            }
          },
          "metadata": {}
        },
        {
          "output_type": "stream",
          "name": "stderr",
          "text": [
            "/usr/local/lib/python3.11/dist-packages/transformers/configuration_utils.py:311: UserWarning: Passing `gradient_checkpointing` to a config initialization is deprecated and will be removed in v5 Transformers. Using `model.gradient_checkpointing_enable()` instead, or if you are using the `Trainer` API, pass `gradient_checkpointing=True` in your `TrainingArguments`.\n",
            "  warnings.warn(\n"
          ]
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "vocab.json:   0%|          | 0.00/291 [00:00<?, ?B/s]"
            ],
            "application/vnd.jupyter.widget-view+json": {
              "version_major": 2,
              "version_minor": 0,
              "model_id": "a92acbb137fc4d5c86a1f83d2223ecbc"
            }
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "special_tokens_map.json:   0%|          | 0.00/85.0 [00:00<?, ?B/s]"
            ],
            "application/vnd.jupyter.widget-view+json": {
              "version_major": 2,
              "version_minor": 0,
              "model_id": "46fbb1a44af54afe8286eb4b9dc557bf"
            }
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "pytorch_model.bin:   0%|          | 0.00/380M [00:00<?, ?B/s]"
            ],
            "application/vnd.jupyter.widget-view+json": {
              "version_major": 2,
              "version_minor": 0,
              "model_id": "96901b7190144f639f45e69c2e346347"
            }
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "model.safetensors:   0%|          | 0.00/380M [00:00<?, ?B/s]"
            ],
            "application/vnd.jupyter.widget-view+json": {
              "version_major": 2,
              "version_minor": 0,
              "model_id": "02c70bec857246c2ba8bf9f978428187"
            }
          },
          "metadata": {}
        },
        {
          "output_type": "stream",
          "name": "stderr",
          "text": [
            "Some weights of Wav2Vec2ForCTC were not initialized from the model checkpoint at facebook/wav2vec2-base and are newly initialized: ['lm_head.bias', 'lm_head.weight']\n",
            "You should probably TRAIN this model on a down-stream task to be able to use it for predictions and inference.\n"
          ]
        },
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Base model and processor loaded successfully\n"
          ]
        }
      ],
      "source": [
        "# Initialise the pre-trained wav2vec2-base processor and model\n",
        "# Processor handles feature extraction; model performs CTC decoding\n",
        "processor = AutoProcessor.from_pretrained(\"facebook/wav2vec2-base\")\n",
        "model = AutoModelForCTC.from_pretrained(\"facebook/wav2vec2-base\").to(\n",
        "    \"cuda\" if torch.cuda.is_available() else \"cpu\"\n",
        ")\n",
        "print(\"Base model and processor loaded successfully\")\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 6,
      "id": "cc63cd6a",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 34
        },
        "id": "cc63cd6a",
        "outputId": "b6ef9103-5b66-42a2-fbdf-f5d8419f220d"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Baseline WER (unfine-tuned model): 1.054\n"
          ]
        }
      ],
      "source": [
        "# Calculate the baseline Word Error Rate (WER) using the unmodified model\n",
        "base_predictions, base_references = [], []\n",
        "for _, row in df.iterrows():\n",
        "    # Load and normalise audio to 16 kHz\n",
        "    speech, _ = librosa.load(row[\"path\"], sr=16000)\n",
        "    if np.max(np.abs(speech)) > 0:\n",
        "        speech = speech / np.max(np.abs(speech))\n",
        "    # Prepare input for the model\n",
        "    inputs = processor(speech, sampling_rate=16000, return_tensors=\"pt\", padding=True)\n",
        "    with torch.no_grad():\n",
        "        logits = model(inputs.input_values.to(model.device)).logits\n",
        "    # Obtain predicted token IDs and decode to text\n",
        "    pred_ids = torch.argmax(logits, dim=-1)\n",
        "    prediction = processor.batch_decode(pred_ids, skip_special_tokens=True)[0]\n",
        "    base_predictions.append(prediction.lower())\n",
        "    base_references.append(row[\"text\"].lower())\n",
        "\n",
        "# Compute and display the baseline WER\n",
        "baseline_error = wer(base_references, base_predictions)\n",
        "print(f\"Baseline WER (unfine-tuned model): {baseline_error:.3f}\")\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 7,
      "id": "fa8c5f27",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "fa8c5f27",
        "outputId": "2521781e-33c3-4518-a339-8374660d5f29"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Prepared training dataset with 49 examples\n"
          ]
        }
      ],
      "source": [
        "# Define a custom PyTorch Dataset for loading audio and corresponding labels\n",
        "class SpeechDataset(Dataset):\n",
        "    def __init__(self, df, processor):\n",
        "        self.examples = df.to_dict('records')\n",
        "        self.processor = processor\n",
        "\n",
        "    def __len__(self):\n",
        "        return len(self.examples)\n",
        "\n",
        "    def __getitem__(self, index):\n",
        "        sample = self.examples[index]\n",
        "        # Load and normalise the audio waveform\n",
        "        speech, _ = librosa.load(sample[\"path\"], sr=16000)\n",
        "        if np.max(np.abs(speech)) > 0:\n",
        "            speech = speech / np.max(np.abs(speech))\n",
        "        # Extract input features and convert transcript to token IDs\n",
        "        inputs = self.processor(speech, sampling_rate=16000).input_values[0]\n",
        "        labels = self.processor.tokenizer(sample[\"text\"]).input_ids\n",
        "        return {\"input_values\": inputs, \"labels\": labels}\n",
        "\n",
        "# Instantiate the dataset\n",
        "train_dataset = SpeechDataset(df, processor)\n",
        "print(f\"Prepared training dataset with {len(train_dataset)} examples\")\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 8,
      "id": "fe90a04a",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "fe90a04a",
        "outputId": "32e25d01-988a-4cb9-d57c-63b5db7bd35d"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Collate function defined for batching and padding\n"
          ]
        }
      ],
      "source": [
        "# Create a collate function to pad inputs and labels for batching\n",
        "from torch.nn.utils.rnn import pad_sequence\n",
        "\n",
        "def collate_fn(batch):\n",
        "    # Separate inputs and labels\n",
        "    input_tensors = [torch.tensor(x[\"input_values\"], dtype=torch.float32) for x in batch]\n",
        "    label_tensors = [torch.tensor(x[\"labels\"], dtype=torch.long) for x in batch]\n",
        "\n",
        "    # Pad input sequences\n",
        "    batch_inputs = processor.pad(\n",
        "        {\"input_values\": input_tensors}, padding=True, return_tensors=\"pt\"\n",
        "    )\n",
        "    # Pad label sequences with -100 to ignore in CTC loss\n",
        "    padded_labels = pad_sequence(label_tensors, batch_first=True, padding_value=-100)\n",
        "    batch_inputs[\"labels\"] = padded_labels\n",
        "    return batch_inputs\n",
        "\n",
        "print(\"Collate function defined for batching and padding\")\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 9,
      "id": "5e78471f",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "5e78471f",
        "outputId": "b6fc6241-184d-4f14-99da-369ecf2181de"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Trainer initialised with specified training arguments\n"
          ]
        },
        {
          "output_type": "stream",
          "name": "stderr",
          "text": [
            "<ipython-input-9-56fdafede2fb>:15: FutureWarning: `tokenizer` is deprecated and will be removed in version 5.0.0 for `Trainer.__init__`. Use `processing_class` instead.\n",
            "  trainer = Trainer(\n"
          ]
        }
      ],
      "source": [
        "# Configure training parameters for fine-tuning\n",
        "training_args = TrainingArguments(\n",
        "    output_dir=\"./wav2vec2-finetuned\",\n",
        "    per_device_train_batch_size=4,\n",
        "    num_train_epochs=10,\n",
        "    learning_rate=1e-4,\n",
        "    fp16=torch.cuda.is_available(),  # use mixed precision if supported\n",
        "    save_steps=100,\n",
        "    logging_steps=10,\n",
        "    save_total_limit=1,\n",
        "    report_to=\"none\"  # disable experiment logging services\n",
        ")\n",
        "\n",
        "# Initialise the Trainer object for the training loop\n",
        "trainer = Trainer(\n",
        "    model=model,\n",
        "    args=training_args,\n",
        "    train_dataset=train_dataset,\n",
        "    data_collator=collate_fn,\n",
        "    tokenizer=processor.feature_extractor\n",
        ")\n",
        "print(\"Trainer initialised with specified training arguments\")\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 10,
      "id": "76bd4fec",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 500
        },
        "id": "76bd4fec",
        "outputId": "75255d98-a1c6-4b1a-b9d6-26ed1c914435"
      },
      "outputs": [
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
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            ],
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              "\n",
              "    <div>\n",
              "      \n",
              "      <progress value='130' max='130' style='width:300px; height:20px; vertical-align: middle;'></progress>\n",
              "      [130/130 1:04:19, Epoch 10/10]\n",
              "    </div>\n",
              "    <table border=\"1\" class=\"dataframe\">\n",
              "  <thead>\n",
              " <tr style=\"text-align: left;\">\n",
              "      <th>Step</th>\n",
              "      <th>Training Loss</th>\n",
              "    </tr>\n",
              "  </thead>\n",
              "  <tbody>\n",
              "    <tr>\n",
              "      <td>10</td>\n",
              "      <td>1185.748300</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>20</td>\n",
              "      <td>274.089500</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>30</td>\n",
              "      <td>211.329300</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>40</td>\n",
              "      <td>180.727700</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>50</td>\n",
              "      <td>160.785400</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>60</td>\n",
              "      <td>150.438500</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>70</td>\n",
              "      <td>130.024300</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>80</td>\n",
              "      <td>117.001400</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>90</td>\n",
              "      <td>143.012900</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>100</td>\n",
              "      <td>120.984700</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>110</td>\n",
              "      <td>109.099300</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>120</td>\n",
              "      <td>126.159100</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <td>130</td>\n",
              "      <td>114.727900</td>\n",
              "    </tr>\n",
              "  </tbody>\n",
              "</table><p>"
            ]
          },
          "metadata": {}
        },
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Fine-tuning complete\n"
          ]
        }
      ],
      "source": [
        "# Execute the fine-tuning of the base model on the custom dataset\n",
        "trainer.train()\n",
        "print(\"Fine-tuning complete\")\n"
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "# ——— Post–training WER ———\n",
        "ft_preds, ft_refs = [], []\n",
        "for _, row in df.iterrows():\n",
        "    audio, _ = librosa.load(row[\"path\"], sr=16000)\n",
        "    if np.max(np.abs(audio)) > 0:\n",
        "        audio = audio / np.max(np.abs(audio))\n",
        "    vals = processor(audio, sampling_rate=16000, return_tensors=\"pt\", padding=True).input_values.to(model.device)\n",
        "    with torch.no_grad():\n",
        "        logits = model(vals).logits\n",
        "    pred = processor.batch_decode(torch.argmax(logits, -1))[0]\n",
        "    ft_preds.append(pred.lower())\n",
        "    ft_refs.append(row[\"text\"].lower())\n",
        "\n",
        "ft_wer = wer_metric.compute(predictions=ft_preds, references=ft_refs)\n",
        "print(f\"Fine-tuned WER: {ft_wer:.3f}\")\n"
      ],
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "Hh4brujTQ1kb",
        "outputId": "08d15923-ddec-4a8c-dbfd-1d10bf1b06ba"
      },
      "id": "Hh4brujTQ1kb",
      "execution_count": 19,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Fine-tuned WER: 1.000\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 20,
      "id": "404ed0a2",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "404ed0a2",
        "outputId": "d2591369-0bf0-4ab3-fc4f-020ae7b4ebe9"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Model and processor saved to /content/wav2vec2-finetuned\n"
          ]
        }
      ],
      "source": [
        "# Save the fine-tuned model and processor for future inference\n",
        "model.save_pretrained(\"/content/wav2vec2-finetuned\")\n",
        "processor.save_pretrained(\"/content/wav2vec2-finetuned\")\n",
        "print(\"Model and processor saved to /content/wav2vec2-finetuned\")\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": 21,
      "id": "d9e025de",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "d9e025de",
        "outputId": "3fbda068-75d7-4197-d475-8a2f43afce95"
      },
      "outputs": [
        {
          "output_type": "stream",
          "name": "stderr",
          "text": [
            "WARNING:pyctcdecode.alphabet:Found entries of length > 1 in alphabet. This is unusual unless style is BPE, but the alphabet was not recognized as BPE type. Is this correct?\n"
          ]
        },
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Beam-search WER: 1.000\n"
          ]
        }
      ],
      "source": [
        "# Perform CTC beam search decoding without an external language model\n",
        "vocab_items = processor.tokenizer.get_vocab().items()\n",
        "sorted_tokens = [token for token, _ in sorted(vocab_items, key=lambda x: x[1])]\n",
        "decoder = build_ctcdecoder(sorted_tokens, kenlm_model_path=None)\n",
        "\n",
        "beam_preds, refs = [], []\n",
        "for _, row in df.iterrows():\n",
        "    speech, _ = librosa.load(row[\"path\"], sr=16000)\n",
        "    if np.max(np.abs(speech)) > 0:\n",
        "        speech = speech / np.max(np.abs(speech))\n",
        "    inputs = processor(speech, sampling_rate=16000, return_tensors=\"pt\", padding=True)\n",
        "    with torch.no_grad():\n",
        "        logits = model(inputs.input_values.to(model.device)).logits[0].detach().cpu().numpy()\n",
        "    # Use a beam width of 50 for decoding\n",
        "    text = decoder.decode(logits, beam_width=50)\n",
        "    beam_preds.append(text.lower())\n",
        "    refs.append(row[\"text\"].lower())\n",
        "\n",
        "# Compute and report the beam-search WER\n",
        "beam_error = wer(refs, beam_preds)\n",
        "print(f\"Beam-search WER: {beam_error:.3f}\")\n"
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "import matplotlib.pyplot as plt\n",
        "\n",
        "# Replace these with actual measured WER values\n",
        "wer_stages = {\n",
        "    'Baseline WER (Pre-training)': 1.0,\n",
        "    'Post-training Greedy WER': 0.85,  # Replace with actual WER\n",
        "    'Beam-search WER': 0.78            # Replace with actual WER\n",
        "}\n",
        "\n",
        "# Extract labels and values for plotting\n",
        "labels = list(wer_stages.keys())\n",
        "wer_values = list(wer_stages.values())\n",
        "\n",
        "# Create bar chart\n",
        "plt.figure(figsize=(10, 6))\n",
        "bars = plt.bar(labels, wer_values, color=['#FF9999', '#99CCFF', '#99FF99'])\n",
        "\n",
        "# Add title and labels\n",
        "plt.title('Comparison of Word Error Rate (WER) at Different Stages')\n",
        "plt.ylabel('Word Error Rate (WER)')\n",
        "plt.xlabel('Evaluation Stage')\n",
        "\n",
        "# Annotate bars with exact WER values\n",
        "for bar, value in zip(bars, wer_values):\n",
        "    plt.text(bar.get_x() + bar.get_width()/2, bar.get_height() - 0.05, f'{value:.2f}',\n",
        "             ha='center', va='top', color='black', fontsize=12)\n",
        "\n",
        "# Improve readability\n",
        "plt.ylim(0, max(wer_values) + 0.1)\n",
        "plt.grid(axis='y', linestyle='--', alpha=0.7)\n",
        "plt.xticks(rotation=15)\n",
        "\n",
        "# Show the plot\n",
        "plt.tight_layout()\n",
        "plt.show()\n"
      ],
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        "id": "UIbvlgfyP59H"
      },
      "id": "UIbvlgfyP59H",
      "execution_count": null,
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    }
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