PyTorch-trainer-and-model-for-Sequence-Classification
After cloning the repository, modify your training data so that the training data is a .csv file and it has 2 columns: Text and Label
In the below example, we will assume that our training data has 3 labels, the name of our training data file is train_data.csv
Example Usage
Import dependencies
import pandas as pd
import numpy as np
from transformers import AutoModel, AutoTokenizer, AutoConfig
from EarlyStopping import *
from modelling import *
from utils import *
Specify arguments
args.pretrained_path will be the path of our pretrained language model
class args:
fold = 0
pretrained_path = 'bert-base-uncased'
max_length = 400
train_batch_size = 16
val_batch_size = 64
epochs = 5
learning_rate = 1e-5
accumulation_steps = 2
num_splits = 5
Create train and validation data
In this example we will train the model using cross-validation. We will split our training data into args.num_splits folds.
df = pd.read_csv('./train_data.csv')
df = create_k_folds(df, args.num_splits)
df_train = df[df['kfold'] == args.fold].reset_index(drop = True)
df_valid = df[df['kfold'] == args.fold].reset_index(drop = True)
Load the language model and its tokenizer
config = AutoConfig.from_pretrained(args.path)
tokenizer = AutoTokenizer.from_pretrained(args.path)
model_transformer = AutoModel.from_pretrained(args.path)
Prepare train and validation dataloaders
features = []
for i in range(len(df_train)):
features.append(prepare_features(tokenizer, df_train.iloc[i, :].to_dict(), args.max_length))
train_dataset = CreateDataset(features)
train_dataloader = create_dataloader(train_dataset, args.train_batch_size, 'train')
features = []
for i in range(len(df_valid)):
features.append(prepare_features(tokenizer, df_valid.iloc[i, :].to_dict(), args.max_length))
val_dataset = CreateDataset(features)
val_dataloader = create_dataloader(val_dataset, args.val_batch_size, 'val')
Use EarlyStopping and customize the score function
NOTE: The customized score function should have 2 parameters: the logits, and the actual label
def accuracy(logits, labels):
logits = logits.detach().cpu().numpy()
labels = labels.detach().cpu().numpy()
pred_classes = np.argmax(logits * (1 / np.sum(logits, axis = -1)).reshape(logits.shape[0], 1), axis = -1)
pred_classes = pred_classes.reshape(labels.shape)
return np.sum(pred_classes == labels) / labels.shape[0]
es = EarlyStopping(mode = 'max', patience = 3, monitor = 'val_acc', out_path = 'model.bin')
es.monitor_score_function = accuracy
Create and train the model
Calling the fit method, the training process will begin
model = Model(config, model_transformer, num_labels = 3)
model.to('cuda')
num_train_steps = int(len(train_dataset) / args.train_batch_size * args.epochs)
model.fit(args.epochs, args.learning_rate, num_train_steps, args.accumulation_steps,
train_dataloader, val_dataloader, es)
NOTE: To complete the cross-validation training process, run the code above again with args.fold equals 1, 2, ..., args.num_splits - 1
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