train.py

import torch
import tqdm
import numpy as np
import evaluation
import evaluate
import json
import random
import math
from tqdm.auto import tqdm
from transformers import BertTokenizer, RobertaTokenizer, BertModel, RobertaModel, RobertaPreTrainedModel, RobertaConfig,  BertConfig, BertPreTrainedModel, PreTrainedModel, AutoModel, AutoTokenizer
from torch.utils.data import DataLoader, RandomSampler, SequentialSampler, TensorDataset
from transformers import AdamW, get_scheduler
from torch import nn
from torch.nn import CrossEntropyLoss
import matplotlib.pyplot as plt
import os
import pandas as pd
import sklearn

metric=evaluate.load("accuracy")
torch.cuda.empty_cache()

#with torch.autocast("cuda"):

def train(model, name, seed,gradient_accumulation_steps,mixup, threshold, lambda_value, mixup_epoch, tmix, mixlayer, train_dataset, test_dataset, num_epochs, learning_rate, batch_size, test_batch_size):
	"""Write Train loop for model with certain train dataset"""
	#set_seed(seed)
	#if model_name[0] == "b":
	#	model=BertForWordClassification.from_pretrained(model_name).to("cuda")
	#elif model_name[0] == "r":
	#	model=RobertaForWordClassification.from_pretrained(model_name),to("cuda")
	print("batch size: ", batch_size)
	print("test batch size: ", test_batch_size)
	print("mix up: ", mixup)
	model.train().to("cuda")
	train_sampler = RandomSampler(train_dataset)
	train_dataloader=DataLoader(train_dataset, sampler=train_sampler, batch_size=batch_size)
	num_training_steps=num_epochs*len(train_dataloader)

	optimizer=AdamW(model.parameters(), lr=learning_rate, eps=1e-8, weight_decay=0.1)
	lr_scheduler=get_scheduler(name="linear", optimizer=optimizer, num_warmup_steps=10, num_training_steps=num_training_steps)

	model.zero_grad()
	#progress_bar=tqdm(range(num_training_steps))

	for epoch in range(num_epochs):
		#for param_tensor in model.state_dict():
		#	print(param_tensor, "\t", model.state_dict()[param_tensor])
		print("Epoche: ", epoch)
		index=0
		for batch in train_dataloader:
			if name[0] == "b":
				inputs = {'input_ids': batch[0],
						  'attention_mask': batch[1],
						  'token_type_ids': batch[2],
						  'start_position': batch[3],
						  'end_position': batch[4],
						  'labels': batch[5]}
				labels=batch[5]
				start_positions=batch[3]
				end_positions=batch[4]
			if name[0] == "r":
				inputs = {'input_ids': batch[0],
						  'attention_mask': batch[1],
						  'start_position': batch[2],
						  'end_position': batch[3],
						  'labels': batch[4]}
				labels = batch[4]
				start_positions=batch[2]
				end_positions=batch[3]
			outputs=model(**inputs)
			#print("outputs: ", outputs)
			#print("outputs 0: ", outputs[0])
			loss=outputs[0]
			#print("length of outputs; ", len(outputs))
			#for i in range(len(outputs)):
			print("Loss: ", loss)
			if mixup == True: #and epoch>=mixup_epoch-1:
				#loss.backward(retain_graph=True)
				loss.backward()
				print("epoch: {0}, retained".format(epoch))
			else:
				loss.backward()
			#if (index+1)%gradient_accumulation_steps==0:
			optimizer.step()
			lr_scheduler.step()
			optimizer.zero_grad()
			model.zero_grad()
			#	#	print("outputs {0}: {1}".format(i, outputs[i].size()))
			if epoch==mixup_epoch:
				if mixup == True:
					#print("length of outputs: ", len(outputs))
					new_matrix_batch, new_labels_batch = mixup_function(outputs[2], labels, lambda_value, threshold)
               		#for matrix in new_matrix_batch

					new_matrix_batch.to("cuda")
					new_labels_batch.to("cuda")

					span_output=torch.randn(new_matrix_batch.shape[0], new_matrix_batch.shape[-1]).to("cuda")
					for i in range(new_matrix_batch.shape[0]):
						span_output[i]=new_matrix_batch[i][start_positions[i]:end_positions[i]].mean(dim=0)
					#print("span output size: ", span_output.size())
					#print("span output: ", span_output)
					logits=model.classifier(span_output.detach()) #target_value?
						
					#print("logits: ", logits)
					print("logits shape: ", list(logits.shape))
					# print("Newlabels: ", new_labels_batch)
					print("labels shape: ", list(new_labels_batch.shape))

					logits = logits.view(-1, 2).to("cuda")
					print("logits: ", logits)
					target = new_labels_batch.view(-1).to("cuda")
					print("Newlabels: ", new_labels_batch)
					loss_2 = cross_entropy(logits, target, lambda_value)
					#loss_2 = SoftCrossEntropyLoss(logits.view(-1, 2).to("cuda"), new_labels_batch.view(-1).to("cuda"))
					#loss_2 = torch.nn.functional.cross_entropy(preds, target.long())
					print("MixUp Loss: ", loss_2)
					#update entire model
					loss_2.backward()
					optimizer.step()
					lr_scheduler.step()
					optimizer.zero_grad()
					model.zero_grad()
			

				#print(outputs[2].size())

			#print(outputs[0].size())
			#progress_bar.update(1)
		#print("one epoch done")
	
	#print(model_name)
	evaluation_test = evaluation.evaluate_model(model, name,  test_dataset, learning_rate, test_batch_size)
	evaluation_train = evaluation.evaluate_model(model, name, train_dataset, learning_rate, test_batch_size)
 
	print("DEV: ", evaluation_test)
	print("TRAIN: ", evaluation_train)

	return evaluation_test, evaluation_train

#log base e
#Fkt vom Meeting
def cross_entropy(logits, target, l):
	print("Lamda Value:", l)
	#makes the logits in log (base) probabilities
	logprobs = torch.nn.functional.log_softmax(logits, dim=1)
	value = target.item() #gets Item (0. or 1.)
	if value == 1 or value == 0:
		one_hot = torch.tensor([1-value,value], device='cuda:0') #creating one-hot vector e.g. [0. ,1.]
		loss_clear_labels = -torch.mul(one_hot, logprobs).sum() #elemetwise multiplication, taking the sum, an removing the negative log
		print("Clear Labels: ", loss_clear_labels)
		return loss_clear_labels
	else:
		if value == l:
			#create vector: [l, 1-l]
			mixed_vec = torch.tensor([l, 1-l], device='cuda')
			loss_mixed_labels = -torch.mul(mixed_vec, logprobs).sum()
			return loss_mixed_labels
		else:
			mixed_vec = torch.tensor([1-l, l], device='cuda')
			loss_mixed_labels = -torch.mul(mixed_vec, logprobs).sum()
			return loss_mixed_labels



def mixup_function(batch_of_matrices, batch_of_labels, l, t):
	runs = math.floor(batch_of_matrices.size()[0]/2)
	counter=0
	results=[]
	result_labels=[]
	for i in range(runs):
		print("doing interpolation with lambda: {0} and threshold: {1}...".format(l, t))
		matrix1=batch_of_matrices[counter]
		label1=batch_of_labels[counter]
		matrix2=batch_of_matrices[counter+1]
		label2=batch_of_labels[counter+1]
		new_matrix, new_label=interpolate(matrix1, label1, matrix2, label2, l, t)
		if new_matrix != None:
			results.append(new_matrix)
			result_labels.append(new_label)
		counter+=2
	results=torch.stack(results)
	result_labels= torch.stack(result_labels) #torch.LongTensor(result_labels)
	#print("mixup done")
	return results, result_labels

def interpolate(matrix1, label1, matrix2, label2, l, threshold):
	new_matrix=(matrix1*l)+(matrix2 * (1-l))
	new_label=(label1*l)+(label2*(1-l))

	#if new_label > 0.5+threshold:
	#	new_label=1
	#elif new_label < 0.5-threshold:
	#	new_label=0
	#else:
	#	print("in undefinded zone")
	#	return None, None
	return new_matrix, new_label#torch.tensor([new_label])
	
def train_salami(model, seed, train_set, test_set, batch_size, test_batch_size, learning_rate, epochs):
	results=[]
	#for num_run, seed in enumerate(random.sample(range(1, 100), num_runs)):
		#if model_name[0]=="b":
		#	model=BertForWordClassification.from_pretrained(model_name)
		#else:
		#	model=RobertaForWordClassification.from_pretrained(model_name)

		#set_seed(seed)
	training_args = TrainingArguments(
		output_dir="./results",  # output directory
		num_train_epochs=epochs,  # total # of training epochs
		per_device_train_batch_size=batch_size,  # batch size per device during training
		per_device_eval_batch_size=test_batch_size,  # batch size for evaluation
		warmup_steps=10,  # number of warmup steps for learning rate scheduler
		weight_decay=0.1,  # strength of weight decay
		learning_rate=learning_rate,
		evaluation_strategy="no",  # evaluates never, per epoch, or every eval_steps
		eval_steps=10,
		logging_dir="./logs",  # directory for storing logs
		seed=seed,  # explicitly set seed
		save_strategy="no",  # do not save checkpoints
	)


	trainer=Trainer(
		model=model,
		train_dataset=train_set,
		eval_dataset=test_set,
		args=training_args,
		compute_metrics=evaluation.evaluate_model
		)

	trainer.train()
	test_set_results=trainer.evaluate()
	results.append(test_set_results)
	print(test_set_results)

	return results

import torch
import tqdm
import numpy as np