neural_network/Text Classification/text_classification_using_BERT.ipynb

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      "name": "text classification using BERT.ipynb",
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      "source": [
        "#Text Classification using BERT\n",
        "\n",
        "The is a basic implementation of text classification pipeline using BERT. The BERT model used has been taken from [huggingface](https://huggingface.co/transformers/). The dataset used is a custom dataset with two classes (labelled as 0 and 1). It is publically available [here](https://raw.githubusercontent.com/prateekjoshi565/Fine-Tuning-BERT/master/spamdata_v2.csv)."
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        "id": "788d3220",
        "outputId": "54b8c951-4479-4581-9f17-d3f7e23bd477"
      },
      "source": [
        "!pip install transformers"
      ],
      "id": "788d3220",
      "execution_count": 1,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Collecting transformers\n",
            "  Downloading transformers-4.10.0-py3-none-any.whl (2.8 MB)\n",
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            "  Downloading tokenizers-0.10.3-cp37-cp37m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl (3.3 MB)\n",
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            "Collecting sacremoses\n",
            "  Downloading sacremoses-0.0.45-py3-none-any.whl (895 kB)\n",
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            "Requirement already satisfied: joblib in /usr/local/lib/python3.7/dist-packages (from sacremoses->transformers) (1.0.1)\n",
            "Installing collected packages: tokenizers, sacremoses, pyyaml, huggingface-hub, transformers\n",
            "  Attempting uninstall: pyyaml\n",
            "    Found existing installation: PyYAML 3.13\n",
            "    Uninstalling PyYAML-3.13:\n",
            "      Successfully uninstalled PyYAML-3.13\n",
            "Successfully installed huggingface-hub-0.0.16 pyyaml-5.4.1 sacremoses-0.0.45 tokenizers-0.10.3 transformers-4.10.0\n"
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      "source": [
        "import csv\n",
        "import pickle\n",
        "import pandas as pd\n",
        "import numpy as np\n",
        "train = pd.read_csv(\"spamdata_v2.csv\")\n"
      ],
      "id": "c90ffee0",
      "execution_count": 1,
      "outputs": []
    },
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        "id": "fdb5210b",
        "outputId": "421a3979-dfdd-4a0f-d331-4b328ba545f3"
      },
      "source": [
        "print(len(train))\n",
        "train.head()"
      ],
      "id": "fdb5210b",
      "execution_count": 2,
      "outputs": [
        {
          "output_type": "stream",
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          "text": [
            "5572\n"
          ]
        },
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              "  <thead>\n",
              "    <tr style=\"text-align: right;\">\n",
              "      <th></th>\n",
              "      <th>label</th>\n",
              "      <th>text</th>\n",
              "    </tr>\n",
              "  </thead>\n",
              "  <tbody>\n",
              "    <tr>\n",
              "      <th>0</th>\n",
              "      <td>0</td>\n",
              "      <td>Go until jurong point, crazy.. Available only ...</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <th>1</th>\n",
              "      <td>0</td>\n",
              "      <td>Ok lar... Joking wif u oni...</td>\n",
              "    </tr>\n",
              "    <tr>\n",
              "      <th>2</th>\n",
              "      <td>1</td>\n",
              "      <td>Free entry in 2 a wkly comp to win FA Cup fina...</td>\n",
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              "      <th>3</th>\n",
              "      <td>0</td>\n",
              "      <td>U dun say so early hor... U c already then say...</td>\n",
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              "    <tr>\n",
              "      <th>4</th>\n",
              "      <td>0</td>\n",
              "      <td>Nah I don't think he goes to usf, he lives aro...</td>\n",
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            "text/plain": [
              "   label                                               text\n",
              "0      0  Go until jurong point, crazy.. Available only ...\n",
              "1      0                      Ok lar... Joking wif u oni...\n",
              "2      1  Free entry in 2 a wkly comp to win FA Cup fina...\n",
              "3      0  U dun say so early hor... U c already then say...\n",
              "4      0  Nah I don't think he goes to usf, he lives aro..."
            ]
          },
          "metadata": {},
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        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "mxdJUOsolsMj"
      },
      "source": [
        "num_classes = 2"
      ],
      "id": "mxdJUOsolsMj",
      "execution_count": 3,
      "outputs": []
    },
    {
      "cell_type": "code",
      "metadata": {
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          "status": "completed"
        },
        "tags": [],
        "id": "eb38df80"
      },
      "source": [
        "from sklearn.model_selection import train_test_split\n",
        "train_split, val_split = train_test_split(train, test_size=.05)"
      ],
      "id": "eb38df80",
      "execution_count": 4,
      "outputs": []
    },
    {
      "cell_type": "code",
      "metadata": {
        "execution": {
          "iopub.execute_input": "2021-07-31T21:06:40.148699Z",
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          "status": "completed"
        },
        "tags": [],
        "id": "a9bbf53d"
      },
      "source": [
        "from transformers import BertTokenizerFast\n",
        "tokenizer = BertTokenizerFast.from_pretrained('bert-base-uncased')"
      ],
      "id": "a9bbf53d",
      "execution_count": 5,
      "outputs": []
    },
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        },
        "tags": [],
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      "source": [
        "import torch\n",
        "\n",
        "class Dataset(torch.utils.data.Dataset):\n",
        "    def __init__(self, df, tokenizer, max_length=128):\n",
        "        self.df = df\n",
        "        self.text = df.text.values\n",
        "        self.labels = df.label.values\n",
        "        self.tokenizer = tokenizer\n",
        "        self.max_length = max_length\n",
        " \n",
        "    def __getitem__(self, idx):\n",
        "        \n",
        "        tokenized_data = tokenizer.tokenize(self.text[idx])\n",
        "        to_append = [\"[CLS]\"] + tokenized_data[:self.max_length - 2] + [\"[SEP]\"]\n",
        "        input_ids = tokenizer.convert_tokens_to_ids(to_append)\n",
        "        input_mask = [1] * len(input_ids)\n",
        "        padding = [0] * (self.max_length - len(input_ids))\n",
        "        input_ids += padding\n",
        "        input_mask += padding\n",
        "        item = {\n",
        "            \"input_ids\": torch.tensor(input_ids, dtype=torch.long),\n",
        "            \"attention_mask\": torch.tensor(input_mask, dtype=torch.long)\n",
        "        }\n",
        "        item['labels'] = torch.tensor(self.labels[idx], dtype=torch.long)\n",
        "        return item\n",
        " \n",
        "    def __len__(self):\n",
        "        return len(self.df)\n",
        "\n",
        "train_dataset = Dataset(train_split.fillna(\"\"), tokenizer)\n",
        "val_dataset = Dataset(val_split.fillna(\"\"), tokenizer)\n",
        "# train_dataset = Dataset(train.fillna(\"\"), tokenizer, is_train=True, label_map=label_map)\n",
        "# test_dataset = Dataset(test.fillna(\"\"), tokenizer, is_train=False)"
      ],
      "id": "f91e37b7",
      "execution_count": 6,
      "outputs": []
    },
    {
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          "status": "completed"
        },
        "tags": [],
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "6186779d",
        "outputId": "9e0874d1-9977-4b48-9c98-3d19e5d4ccd0"
      },
      "source": [
        "from transformers import BertForSequenceClassification, Trainer, TrainingArguments\n",
        "\n",
        "training_args = TrainingArguments(\n",
        "    output_dir='./results',          # output directory\n",
        "    num_train_epochs=50,              # total number of training epochs\n",
        "    per_device_train_batch_size=64, # batch size per device during training\n",
        "    per_device_eval_batch_size=64,  # batch size for evaluation\n",
        "    warmup_steps=500,               # number of warmup steps for learning rate scheduler\n",
        "    weight_decay=0.01,               # strength of weight decay\n",
        "    logging_dir='./logs',            # directory for storing logs\n",
        "    logging_steps=100,\n",
        "    dataloader_num_workers=2,\n",
        "    report_to=\"tensorboard\",\n",
        "    label_smoothing_factor=0.1,\n",
        "    evaluation_strategy=\"steps\",\n",
        "    eval_steps=500, # Evaluation and Save happens every 500 steps\n",
        "    save_total_limit=3, # Only last 5 models are saved. Older ones are deleted.\n",
        "    load_best_model_at_end=True,   #best model is always saved\n",
        ")\n",
        "\n",
        "model = BertForSequenceClassification.from_pretrained(\"bert-base-uncased\")\n",
        "model.classifier = torch.nn.Linear(768, num_classes)\n",
        "model.num_labels = num_classes"
      ],
      "id": "6186779d",
      "execution_count": 7,
      "outputs": [
        {
          "output_type": "stream",
          "name": "stderr",
          "text": [
            "Some weights of the model checkpoint at bert-base-uncased were not used when initializing BertForSequenceClassification: ['cls.predictions.transform.dense.bias', 'cls.predictions.bias', 'cls.predictions.transform.LayerNorm.weight', 'cls.seq_relationship.weight', 'cls.predictions.transform.LayerNorm.bias', 'cls.seq_relationship.bias', 'cls.predictions.decoder.weight', 'cls.predictions.transform.dense.weight']\n",
            "- This IS expected if you are initializing BertForSequenceClassification from the checkpoint of a model trained on another task or with another architecture (e.g. initializing a BertForSequenceClassification model from a BertForPreTraining model).\n",
            "- This IS NOT expected if you are initializing BertForSequenceClassification from the checkpoint of a model that you expect to be exactly identical (initializing a BertForSequenceClassification model from a BertForSequenceClassification model).\n",
            "Some weights of BertForSequenceClassification were not initialized from the model checkpoint at bert-base-uncased and are newly initialized: ['classifier.weight', 'classifier.bias']\n",
            "You should probably TRAIN this model on a down-stream task to be able to use it for predictions and inference.\n"
          ]
        }
      ]
    },
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        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 675
        },
        "id": "13abf542",
        "outputId": "42a52c37-29f9-4f43-a70f-c285886f0c10"
      },
      "source": [
        "trainer = Trainer(\n",
        "    model=model,                         # the instantiated 🤗 Transformers model to be trained\n",
        "    args=training_args,                  # training arguments, defined above\n",
        "    train_dataset=train_dataset,         # training dataset\n",
        "    eval_dataset=val_dataset             # evaluation dataset\n",
        ")\n",
        "trainer.train()"
      ],
      "id": "13abf542",
      "execution_count": null,
      "outputs": [
        {
          "metadata": {
            "tags": null
          },
          "name": "stderr",
          "output_type": "stream",
          "text": [
            "***** Running training *****\n",
            "  Num examples = 5293\n",
            "  Num Epochs = 50\n",
            "  Instantaneous batch size per device = 64\n",
            "  Total train batch size (w. parallel, distributed & accumulation) = 64\n",
            "  Gradient Accumulation steps = 1\n",
            "  Total optimization steps = 4150\n"
          ]
        },
        {
          "data": {
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              "    <div>\n",
              "      \n",
              "      <progress value='408' max='4150' style='width:300px; height:20px; vertical-align: middle;'></progress>\n",
              "      [ 408/4150 16:23 < 2:31:08, 0.41 it/s, Epoch 4.90/50]\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",
              "      <th>Validation Loss</th>\n",
              "    </tr>\n",
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              "      \n",
              "      <progress value='1507' max='4150' style='width:300px; height:20px; vertical-align: middle;'></progress>\n",
              "      [1507/4150 1:01:13 < 1:47:31, 0.41 it/s, Epoch 18.14/50]\n",
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              "    <table border=\"1\" class=\"dataframe\">\n",
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              "      <td>500</td>\n",
              "      <td>0.243900</td>\n",
              "      <td>0.221590</td>\n",
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              "      <td>1000</td>\n",
              "      <td>0.200800</td>\n",
              "      <td>0.217612</td>\n",
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              "    <tr>\n",
              "      <td>1500</td>\n",
              "      <td>0.198900</td>\n",
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          "text": [
            "***** Running Evaluation *****\n",
            "  Num examples = 279\n",
            "  Batch size = 64\n",
            "Saving model checkpoint to ./results/checkpoint-500\n",
            "Configuration saved in ./results/checkpoint-500/config.json\n",
            "Model weights saved in ./results/checkpoint-500/pytorch_model.bin\n",
            "***** Running Evaluation *****\n",
            "  Num examples = 279\n",
            "  Batch size = 64\n",
            "Saving model checkpoint to ./results/checkpoint-1000\n",
            "Configuration saved in ./results/checkpoint-1000/config.json\n",
            "Model weights saved in ./results/checkpoint-1000/pytorch_model.bin\n",
            "***** Running Evaluation *****\n",
            "  Num examples = 279\n",
            "  Batch size = 64\n",
            "Saving model checkpoint to ./results/checkpoint-1500\n",
            "Configuration saved in ./results/checkpoint-1500/config.json\n",
            "Model weights saved in ./results/checkpoint-1500/pytorch_model.bin\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "lsoxR09ymdHv"
      },
      "source": [
        ""
      ],
      "id": "lsoxR09ymdHv",
      "execution_count": null,
      "outputs": []
    }
  ]
}