{ "cells": [ { "cell_type": "markdown", "id": "fdd7ff16", "metadata": {}, "source": [ "# T4. fastNLP 中的预定义模型\n", "\n", " 1 fastNLP 中 modules 的介绍\n", " \n", " 1.1 modules 模块、models 模块 简介\n", "\n", " 1.2 示例一:modules 实现 LSTM 分类\n", "\n", " 2 fastNLP 中 models 的介绍\n", " \n", " 2.1 示例一:models 实现 CNN 分类\n", "\n", " 2.3 示例二:models 实现 BiLSTM 标注" ] }, { "cell_type": "markdown", "id": "d3d65d53", "metadata": {}, "source": [ "## 1. fastNLP 中 modules 模块的介绍\n", "\n", "### 1.1 modules 模块、models 模块 简介\n", "\n", "在`fastNLP 0.8`中,**`modules.torch`路径下定义了一些基于`pytorch`实现的基础模块**\n", "\n", " 包括长短期记忆网络`LSTM`、条件随机场`CRF`、`transformer`的编解码器模块等,详见下表\n", "\n", "|
\n", "\n" ], "text/plain": [ "\n" ] }, "metadata": {}, "output_type": "display_data" }, { "data": { "application/vnd.jupyter.widget-view+json": { "model_id": "", "version_major": 2, "version_minor": 0 }, "text/plain": [ "Processing: 0%| | 0/6000 [00:00, ?it/s]" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "import sys\n", "sys.path.append('..')\n", "\n", "from fastNLP import DataSet\n", "\n", "dataset = DataSet.from_pandas(sst2data['train'].to_pandas())[:6000]\n", "\n", "dataset.apply_more(lambda ins:{'words': ins['sentence'].lower().split(), 'target': ins['label']}, \n", " progress_bar=\"tqdm\")\n", "dataset.delete_field('sentence')\n", "dataset.delete_field('label')\n", "dataset.delete_field('idx')\n", "\n", "from fastNLP import Vocabulary\n", "\n", "vocab = Vocabulary()\n", "vocab.from_dataset(dataset, field_name='words')\n", "vocab.index_dataset(dataset, field_name='words')\n", "\n", "train_dataset, evaluate_dataset = dataset.split(ratio=0.85)" ] }, { "cell_type": "markdown", "id": "96380c67", "metadata": {}, "source": [ " 然后,使用`tutorial-3`中的知识,**通过`prepare_torch_dataloader`处理数据集得到`dataloader`**" ] }, { "cell_type": "code", "execution_count": 3, "id": "b9dd1273", "metadata": {}, "outputs": [], "source": [ "from fastNLP import prepare_torch_dataloader\n", "\n", "train_dataloader = prepare_torch_dataloader(train_dataset, batch_size=16, shuffle=True)\n", "evaluate_dataloader = prepare_torch_dataloader(evaluate_dataset, batch_size=16)" ] }, { "cell_type": "markdown", "id": "eb75aaba", "metadata": {}, "source": [ "模型使用方面,这里使用`Embedding`、`LSTM`、`MLP`等模块搭建模型,方法类似`pytorch`,结构如下所示\n", "\n", "```\n", "ClsByModules(\n", " (embedding): Embedding(\n", " (embed): Embedding(8458, 100)\n", " (dropout): Dropout(p=0.0, inplace=False)\n", " )\n", " (lstm): LSTM(\n", " (lstm): LSTM(100, 64, num_layers=2, batch_first=True, bidirectional=True)\n", " )\n", " (mlp): MLP(\n", " (hiddens): ModuleList()\n", " (output): Linear(in_features=128, out_features=2, bias=True)\n", " (dropout): Dropout(p=0.5, inplace=False)\n", " )\n", " (loss_fn): CrossEntropyLoss()\n", ")\n", "```" ] }, { "cell_type": "code", "execution_count": 4, "id": "0b25b25c", "metadata": {}, "outputs": [], "source": [ "import torch\n", "import torch.nn as nn\n", "\n", "from fastNLP.modules.torch import LSTM, MLP\n", "from fastNLP.embeddings.torch import Embedding\n", "\n", "\n", "class ClsByModules(nn.Module):\n", " def __init__(self, vocab_size, embedding_dim, output_dim, hidden_dim=64, num_layers=2, dropout=0.5):\n", " nn.Module.__init__(self)\n", "\n", " self.embedding = Embedding((vocab_size, embedding_dim))\n", " self.lstm = LSTM(embedding_dim, hidden_dim, num_layers=num_layers, bidirectional=True)\n", " self.mlp = MLP([hidden_dim * 2, output_dim], dropout=dropout)\n", " \n", " self.loss_fn = nn.CrossEntropyLoss()\n", "\n", " def forward(self, words):\n", " output = self.embedding(words)\n", " output, (hidden, cell) = self.lstm(output)\n", " output = self.mlp(torch.cat((hidden[-1], hidden[-2]), dim=1))\n", " return output\n", " \n", " def train_step(self, words, target):\n", " pred = self(words)\n", " return {\"loss\": self.loss_fn(pred, target)}\n", "\n", " def evaluate_step(self, words, target):\n", " pred = self(words)\n", " pred = torch.max(pred, dim=-1)[1]\n", " return {\"pred\": pred, \"target\": target}" ] }, { "cell_type": "markdown", "id": "4890de5a", "metadata": {}, "source": [ " 接着,初始化模型`model`实例,同时,使用`torch.optim.AdamW`初始化`optimizer`实例" ] }, { "cell_type": "code", "execution_count": 5, "id": "9dbbf50d", "metadata": {}, "outputs": [], "source": [ "model = ClsByModules(vocab_size=len(vocab), embedding_dim=100, output_dim=2)\n", "\n", "from torch.optim import AdamW\n", "\n", "optimizers = AdamW(params=model.parameters(), lr=5e-5)" ] }, { "cell_type": "markdown", "id": "054538f5", "metadata": {}, "source": [ " 最后,使用`trainer`模块,集成`model`、`optimizer`、`dataloader`、`metric`训练" ] }, { "cell_type": "code", "execution_count": 6, "id": "7a93432f", "metadata": {}, "outputs": [], "source": [ "from fastNLP import Trainer, Accuracy\n", "\n", "trainer = Trainer(\n", " model=model,\n", " driver='torch',\n", " device=0, # 'cuda'\n", " n_epochs=10,\n", " optimizers=optimizers,\n", " train_dataloader=train_dataloader,\n", " evaluate_dataloaders=evaluate_dataloader,\n", " metrics={'acc': Accuracy()}\n", ")" ] }, { "cell_type": "code", "execution_count": 7, "id": "31102e0f", "metadata": {}, "outputs": [ { "data": { "text/html": [ "
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\n", "\n" ], "text/plain": [ "\n" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "trainer.run(num_eval_batch_per_dl=10)" ] }, { "cell_type": "code", "execution_count": 8, "id": "8bc4bfb2", "metadata": {}, "outputs": [ { "data": { "application/vnd.jupyter.widget-view+json": { "model_id": "", "version_major": 2, "version_minor": 0 }, "text/plain": [ "Output()" ] }, "metadata": {}, "output_type": "display_data" }, { "data": { "text/html": [ "\n" ], "text/plain": [] }, "metadata": {}, "output_type": "display_data" }, { "data": { "text/plain": [ "{'acc#acc': 0.712222, 'total#acc': 900.0, 'correct#acc': 641.0}" ] }, "execution_count": 8, "metadata": {}, "output_type": "execute_result" } ], "source": [ "trainer.evaluator.run()" ] }, { "cell_type": "markdown", "id": "07538876", "metadata": {}, "source": [ " 注:此处使用`gc`模块删除相关变量,释放内存,为接下来新的模型训练预留存储空间,下同" ] }, { "cell_type": "code", "execution_count": 9, "id": "1b52eafd", "metadata": {}, "outputs": [ { "data": { "text/plain": [ "383" ] }, "execution_count": 9, "metadata": {}, "output_type": "execute_result" } ], "source": [ "import gc\n", "\n", "del model\n", "del trainer\n", "del dataset\n", "del sst2data\n", "\n", "gc.collect()" ] }, { "cell_type": "markdown", "id": "d9443213", "metadata": {}, "source": [ "## 2. fastNLP 中 models 模块的介绍\n", "\n", "### 2.1 示例一:models 实现 CNN 分类\n", "\n", " 本示例使用`fastNLP 0.8`中预定义模型`models`中的`CNNText`模型,实现`SST-2`文本二分类任务\n", "\n", "数据使用方面,此处沿用在上个示例中展示的`SST-2`数据集,数据加载过程相同且已经执行过了,因此简略\n", "\n", "模型使用方面,如上所述,这里使用**基于卷积神经网络`CNN`的预定义文本分类模型`CNNText`**,结构如下所示\n", "\n", " 首先是内置的`100`维嵌入层、`dropout`层、紧接着是三个一维卷积,将`100`维嵌入特征,分别通过\n", "\n", " **感受野为`1`、`3`、`5`的卷积算子变换至`30`维、`40`维、`50`维的卷积特征**,再将三者拼接\n", "\n", " 最终再次通过`dropout`层、线性变换层,映射至二元的输出值,对应两个分类结果上的几率`logits`\n", "\n", "```\n", "CNNText(\n", " (embed): Embedding(\n", " (embed): Embedding(5194, 100)\n", " (dropout): Dropout(p=0.0, inplace=False)\n", " )\n", " (conv_pool): ConvMaxpool(\n", " (convs): ModuleList(\n", " (0): Conv1d(100, 30, kernel_size=(1,), stride=(1,), bias=False)\n", " (1): Conv1d(100, 40, kernel_size=(3,), stride=(1,), padding=(1,), bias=False)\n", " (2): Conv1d(100, 50, kernel_size=(5,), stride=(1,), padding=(2,), bias=False)\n", " )\n", " )\n", " (dropout): Dropout(p=0.1, inplace=False)\n", " (fc): Linear(in_features=120, out_features=2, bias=True)\n", ")\n", "```\n", "\n", "对应到代码上,**从`fastNLP.models.torch`路径下导入`CNNText`**,初始化`CNNText`和`optimizer`实例\n", "\n", " 注意:初始化`CNNText`时,**二元组参数`embed`、分类数量`num_classes`是必须传入的**,其中\n", "\n", " **`embed`表示嵌入层的嵌入抽取矩阵大小**,因此第二个元素对应的是默认隐藏层维度 `100`维" ] }, { "cell_type": "code", "execution_count": 10, "id": "f6e76e2e", "metadata": {}, "outputs": [], "source": [ "from fastNLP.models.torch import CNNText\n", "\n", "model = CNNText(embed=(len(vocab), 100), num_classes=2, dropout=0.1)\n", "\n", "from torch.optim import AdamW\n", "\n", "optimizers = AdamW(params=model.parameters(), lr=5e-4)" ] }, { "cell_type": "markdown", "id": "0cc5ca10", "metadata": {}, "source": [ " 最后,使用`trainer`模块,集成`model`、`optimizer`、`dataloader`、`metric`训练" ] }, { "cell_type": "code", "execution_count": 11, "id": "50a13ee5", "metadata": {}, "outputs": [], "source": [ "from fastNLP import Trainer, Accuracy\n", "\n", "trainer = Trainer(\n", " model=model,\n", " driver='torch',\n", " device=0, # 'cuda'\n", " n_epochs=10,\n", " optimizers=optimizers,\n", " train_dataloader=train_dataloader,\n", " evaluate_dataloaders=evaluate_dataloader,\n", " metrics={'acc': Accuracy()}\n", ")" ] }, { "cell_type": "code", "execution_count": 12, "id": "28903a7d", "metadata": {}, "outputs": [ { "data": { "text/html": [ "
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\n", "\n" ], "text/plain": [ "\n" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "trainer.run()" ] }, { "cell_type": "code", "execution_count": 13, "id": "f47a6a35", "metadata": {}, "outputs": [ { "data": { "application/vnd.jupyter.widget-view+json": { "model_id": "", "version_major": 2, "version_minor": 0 }, "text/plain": [ "Output()" ] }, "metadata": {}, "output_type": "display_data" }, { "data": { "text/html": [ "\n" ], "text/plain": [] }, "metadata": {}, "output_type": "display_data" }, { "data": { "text/plain": [ "{'acc#acc': 0.806667, 'total#acc': 900.0, 'correct#acc': 726.0}" ] }, "execution_count": 13, "metadata": {}, "output_type": "execute_result" } ], "source": [ "trainer.evaluator.run()" ] }, { "cell_type": "markdown", "id": "5b5c0446", "metadata": {}, "source": [ " 注:此处使用`gc`模块删除相关变量,释放内存,为接下来新的模型训练预留存储空间,下同" ] }, { "cell_type": "code", "execution_count": 14, "id": "e9e70f88", "metadata": {}, "outputs": [ { "data": { "text/plain": [ "344" ] }, "execution_count": 14, "metadata": {}, "output_type": "execute_result" } ], "source": [ "import gc\n", "\n", "del model\n", "del trainer\n", "\n", "gc.collect()" ] }, { "cell_type": "markdown", "id": "6aec2a19", "metadata": {}, "source": [ "### 2.2 示例二:models 实现 BiLSTM 标注\n", "\n", " 通过两个示例一的对比可以发现,得益于`models`对模型结构的封装,使用`models`明显更加便捷\n", "\n", " 针对更加复杂的模型时,编码更加轻松;本示例将使用`models`中的`BiLSTMCRF`模型\n", "\n", " 避免`CRF`和`Viterbi`算法代码书写的困难,轻松实现`CoNLL-2003`中的命名实体识别`NER`任务\n", "\n", "模型使用方面,如上所述,这里使用**基于双向`LSTM`+条件随机场`CRF`的标注模型`BiLSTMCRF`**,结构如下所示\n", "\n", " 其中,隐藏层维度默认`100`维,因此对应双向`LSTM`输出`200`维,`dropout`层退学概率、`LSTM`层数可调\n", "\n", "```\n", "BiLSTMCRF(\n", " (embed): Embedding(7590, 100)\n", " (lstm): LSTM(\n", " (lstm): LSTM(100, 100, batch_first=True, bidirectional=True)\n", " )\n", " (dropout): Dropout(p=0.1, inplace=False)\n", " (fc): Linear(in_features=200, out_features=9, bias=True)\n", " (crf): ConditionalRandomField()\n", ")\n", "```\n", "\n", "数据使用方面,此处仍然**使用`datasets`模块中的`load_dataset`函数**,以如下形式,加载`CoNLL-2003`数据集\n", "\n", " 首次下载后会保存至`~.cache/huggingface/datasets/conll2003/conll2003/1.0.0/`目录下" ] }, { "cell_type": "code", "execution_count": 15, "id": "03e66686", "metadata": {}, "outputs": [ { "name": "stderr", "output_type": "stream", "text": [ "Reusing dataset conll2003 (/remote-home/xrliu/.cache/huggingface/datasets/conll2003/conll2003/1.0.0/63f4ebd1bcb7148b1644497336fd74643d4ce70123334431a3c053b7ee4e96ee)\n" ] }, { "data": { "application/vnd.jupyter.widget-view+json": { "model_id": "593bc03ed5914953ab94268ff2f01710", "version_major": 2, "version_minor": 0 }, "text/plain": [ " 0%| | 0/3 [00:00, ?it/s]" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "from datasets import load_dataset\n", "\n", "ner2data = load_dataset('conll2003', 'conll2003')" ] }, { "cell_type": "markdown", "id": "fc505631", "metadata": {}, "source": [ "紧接着,使用`tutorial-1`和`tutorial-2`中的知识,将数据集转化为`fastNLP`中的`DataSet`格式\n", "\n", " 完成数据集格式调整、文本序列化等操作;此处**需要`'words'`、`'seq_len'`、`'target'`三个字段**\n", "\n", "此外,**需要定义`NER`标签到标签序号的映射**(**词汇表`label_vocab`**),数据集中标签已经完成了序号映射\n", "\n", " 所以需要人工定义**`9`个标签对应之前的`9`个分类目标**;数据集说明中规定,`'O'`表示其他标签\n", "\n", " **后缀`'-PER'`、`'-ORG'`、`'-LOC'`、`'-MISC'`对应人名、组织名、地名、时间等其他命名**\n", "\n", " **前缀`'B-'`表示起始标签、`'I-'`表示终止标签**;例如,`'B-PER'`表示人名实体的起始标签" ] }, { "cell_type": "code", "execution_count": 16, "id": "1f88cad4", "metadata": {}, "outputs": [ { "data": { "application/vnd.jupyter.widget-view+json": { "model_id": "", "version_major": 2, "version_minor": 0 }, "text/plain": [ "Processing: 0%| | 0/4000 [00:00, ?it/s]" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "import sys\n", "sys.path.append('..')\n", "\n", "from fastNLP import DataSet\n", "\n", "dataset = DataSet.from_pandas(ner2data['train'].to_pandas())[:4000]\n", "\n", "dataset.apply_more(lambda ins:{'words': ins['tokens'], 'seq_len': len(ins['tokens']), 'target': ins['ner_tags']}, \n", " progress_bar=\"tqdm\")\n", "dataset.delete_field('tokens')\n", "dataset.delete_field('ner_tags')\n", "dataset.delete_field('pos_tags')\n", "dataset.delete_field('chunk_tags')\n", "dataset.delete_field('id')\n", "\n", "from fastNLP import Vocabulary\n", "\n", "token_vocab = Vocabulary()\n", "token_vocab.from_dataset(dataset, field_name='words')\n", "token_vocab.index_dataset(dataset, field_name='words')\n", "label_vocab = Vocabulary(padding=None, unknown=None)\n", "label_vocab.add_word_lst(['O', 'B-PER', 'I-PER', 'B-ORG', 'I-ORG', 'B-LOC', 'I-LOC', 'B-MISC', 'I-MISC'])\n", "\n", "train_dataset, evaluate_dataset = dataset.split(ratio=0.85)" ] }, { "cell_type": "markdown", "id": "d9889427", "metadata": {}, "source": [ "然后,同样使用`tutorial-3`中的知识,通过`prepare_torch_dataloader`处理数据集得到`dataloader`" ] }, { "cell_type": "code", "execution_count": 17, "id": "7802a072", "metadata": {}, "outputs": [], "source": [ "from fastNLP import prepare_torch_dataloader\n", "\n", "train_dataloader = prepare_torch_dataloader(train_dataset, batch_size=16, shuffle=True)\n", "evaluate_dataloader = prepare_torch_dataloader(evaluate_dataset, batch_size=16)" ] }, { "cell_type": "markdown", "id": "2bc7831b", "metadata": {}, "source": [ "接着,**从`fastNLP.models.torch`路径下导入`BiLSTMCRF`**,初始化`BiLSTMCRF`实例和优化器\n", "\n", " 注意:初始化`BiLSTMCRF`时,和`CNNText`相同,**参数`embed`、`num_classes`是必须传入的**\n", "\n", " 隐藏层维度`hidden_size`默认`100`维,调整`150`维;退学概率默认`0.1`,调整`0.2`" ] }, { "cell_type": "code", "execution_count": 18, "id": "4e12c09f", "metadata": {}, "outputs": [], "source": [ "from fastNLP.models.torch import BiLSTMCRF\n", "\n", "model = BiLSTMCRF(embed=(len(token_vocab), 150), num_classes=len(label_vocab), \n", " num_layers=1, hidden_size=150, dropout=0.2)\n", "\n", "from torch.optim import AdamW\n", "\n", "optimizers = AdamW(params=model.parameters(), lr=1e-3)" ] }, { "cell_type": "markdown", "id": "bf30608f", "metadata": {}, "source": [ "最后,使用`trainer`模块,集成`model`、`optimizer`、`dataloader`、`metric`训练\n", "\n", " **使用`SpanFPreRecMetric`作为`NER`的评价标准**,详细请参考接下来的`tutorial-5`\n", "\n", " 同时,**初始化时需要添加`vocabulary`形式的标签与序号之间的映射`tag_vocab`**" ] }, { "cell_type": "code", "execution_count": 19, "id": "cbd6c205", "metadata": {}, "outputs": [], "source": [ "from fastNLP import Trainer, SpanFPreRecMetric\n", "\n", "trainer = Trainer(\n", " model=model,\n", " driver='torch',\n", " device=0, # 'cuda'\n", " n_epochs=10,\n", " optimizers=optimizers,\n", " train_dataloader=train_dataloader,\n", " evaluate_dataloaders=evaluate_dataloader,\n", " metrics={'F1': SpanFPreRecMetric(tag_vocab=label_vocab)}\n", ")" ] }, { "cell_type": "code", "execution_count": 20, "id": "0f8eff34", "metadata": {}, "outputs": [ { "data": { "text/html": [ "
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