摘要：
昇思MindSpore AI框架中使用openai-gpt的方法、步骤。
没调通，存疑。
一、环境配置
%%capture captured_output
# 实验环境已经预装了mindspore==2.2.14，如需更换mindspore版本，可更改下面mindspore的版本号
!pip uninstall mindspore -y
!pip install -i https://pypi.mirrors.ustc.edu.cn/simple mindspore==2.2.14
# 该案例在 mindnlp 0.3.1 版本完成适配，如果发现案例跑不通，可以指定mindnlp版本，执行`!pip install mindnlp==0.3.1`
!pip install mindnlp==0.3.1
!pip install jieba
%env HF_ENDPOINT=https://hf-mirror.com输出：
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
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[notice] To update, run: python -m pip install --upgrade pip
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Requirement already satisfied: jieba in /home/nginx/miniconda/envs/jupyter/lib/python3.9/site-packages (0.42.1)[notice] A new release of pip is available: 24.1 -> 24.1.1
[notice] To update, run: python -m pip install --upgrade pip
env: HF_ENDPOINT=https://hf-mirror.com导入os mindspore dataset nn _legacy等模块
import os
import mindspore
from mindspore.dataset import text, GeneratorDataset, transforms
from mindspore import nn
from mindnlp.dataset import load_dataset
from mindnlp._legacy.engine import Trainer, Evaluator
from mindnlp._legacy.engine.callbacks import CheckpointCallback, BestModelCallback
from mindnlp._legacy.metrics import Accuracy输出：
Building prefix dict from the default dictionary ...
Dumping model to file cache /tmp/jieba.cache
Loading model cost 1.027 seconds.
Prefix dict has been built successfully.二、加载训练数据集和测试数据集
imdb_ds = load_dataset('imdb', split=['train', 'test'])
imdb_train = imdb_ds['train']
imdb_test = imdb_ds['test']输出：
Downloading readme:－－ 7.81k/? [00:00<00:00, 478kB/s]
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Generating train split: 100%－－－－－－－－－－－－－－－－ 25000/25000 [00:00<00:00, 102317.15 examples/s]
Generating test split: 100%－－－－－－－－－－－－－－－－ 25000/25000 [00:00<00:00, 130128.57 examples/s]
Generating unsupervised split: 100%－－－－－－－－－－－－－－－－ 50000/50000 [00:00<00:00, 140883.29 examples/s]imdb_train.get_dataset_size()输出：
25000三、预处理数据集
import numpy as np
def process_dataset(dataset, tokenizer, max_seq_len=512, batch_size=4, shuffle=False):is_ascend = mindspore.get_context('device_target') == 'Ascend'def tokenize(text):if is_ascend:tokenized = tokenizer(text, padding='max_length', truncation=True, max_length=max_seq_len)else:tokenized = tokenizer(text, truncation=True, max_length=max_seq_len)return tokenized['input_ids'], tokenized['attention_mask']
if shuffle:dataset = dataset.shuffle(batch_size)
# map dataset
dataset = dataset.map(operations=[tokenize], input_columns="text",
output_columns=['input_ids', 'attention_mask'])
dataset = dataset.map(operations=transforms.TypeCast(mindspore.int32),
input_columns="label", output_columns="labels")# batch datasetif is_ascend:dataset = dataset.batch(batch_size)else:dataset = dataset.padded_batch(batch_size, pad_info={'input_ids': (None, tokenizer.pad_token_id),'attention_mask': (None, 0)})
return datasetfrom mindnlp.transformers import GPTTokenizer
# tokenizer
gpt_tokenizer = GPTTokenizer.from_pretrained('openai-gpt')
# add sepcial token: <PAD>
special_tokens_dict = {"bos_token": "<bos>","eos_token": "<eos>","pad_token": "<pad>",
}
num_added_toks = gpt_tokenizer.add_special_tokens(special_tokens_dict)输出：
连接失败，不知是否openai关闭服务的原因。
【从此往下，执行不下去了】
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# split train dataset into train and valid datasets
imdb_train, imdb_val = imdb_train.split([0.7, 0.3])
dataset_train = process_dataset(imdb_train, gpt_tokenizer, shuffle=True)
dataset_val = process_dataset(imdb_val, gpt_tokenizer)
dataset_test = process_dataset(imdb_test, gpt_tokenizer)next(dataset_train.create_tuple_iterator())输出：
[Tensor(shape=[4, 512], dtype=Int64, value=[[ 11, 250, 15 ... 3, 242, 3],[ 5, 23, 5 ... 40480, 40480, 40480],[ 14, 3, 5 ... 243, 8, 18073],[ 7, 250, 3 ... 40480, 40480, 40480]]),Tensor(shape=[4, 512], dtype=Int64, value=[[1, 1, 1 ... 1, 1, 1],[1, 1, 1 ... 0, 0, 0],[1, 1, 1 ... 1, 1, 1],[1, 1, 1 ... 0, 0, 0]]),Tensor(shape=[4], dtype=Int32, value= [0, 1, 0, 1])]from mindnlp.transformers import GPTForSequenceClassification
from mindspore.experimental.optim import Adam# set bert config and define parameters for training
model = GPTForSequenceClassification.from_pretrained('openai-gpt', num_labels=2)
model.config.pad_token_id = gpt_tokenizer.pad_token_id
model.resize_token_embeddings(model.config.vocab_size + 3)optimizer = nn.Adam(model.trainable_params(), learning_rate=2e-5)metric = Accuracy()# define callbacks to save checkpoints
ckpoint_cb = CheckpointCallback(save_path='checkpoint', ckpt_name='gpt_imdb_finetune', epochs=1, keep_checkpoint_max=2)
best_model_cb = BestModelCallback(save_path='checkpoint', ckpt_name='gpt_imdb_finetune_best', auto_load=True)trainer = Trainer(network=model, train_dataset=dataset_train,eval_dataset=dataset_train, metrics=metric,epochs=1, optimizer=optimizer, callbacks=[ckpoint_cb, best_model_cb],jit=False)输出：
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100%－－－－－－－－－－－－－－－－ 74.0/74.0 [00:00<00:00, 4.28kB/s]四、训练
trainer.run(tgt_columns="labels")五、评估
evaluator = Evaluator(network=model, eval_dataset=dataset_test, metrics=metric)
evaluator.run(tgt_columns="labels")
