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train_vqa_embedding.py
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train_vqa_embedding.py
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import sys
import os.path
import math
import json
import numpy as np
import random
import torch
import torch.nn as nn
import torch.nn.functional as F
import torch.optim as optim
from torch.autograd import Variable
import torch.backends.cudnn as cudnn
from tqdm import tqdm
import copy
import argparse
import time
cudnn.enabled = True
cudnn.benchmark = True
from ansemb.config import cfg, set_random_seed, update_train_configs
import ansemb.dataset.vqa as data
import ansemb.models.embedding as model
import ansemb.utils as utils
from ansemb.utils import cosine_sim
from ansemb.vector import Vector
parser = argparse.ArgumentParser()
parser.add_argument('--gpu_id', default=0, type=int)
parser.add_argument('--finetune', action='store_true')
parser.add_argument('--batch_size', default=128, type=float)
parser.add_argument('--max_negative_answer', default=12000, type=int)
parser.add_argument('--answer_batch_size', default=3000, type=int)
parser.add_argument('--loss_temperature', default=0.01, type=float)
parser.add_argument('--pretrained_model', default=None, type=str)
parser.add_argument('--context_embedding', default='SAN', choices=['SAN', 'BoW'])
parser.add_argument('--answer_embedding', default='BoW', choices=['BoW', 'RNN'])
parser.add_argument('--name', default=None, type=str)
args = parser.parse_args()
# fix random seed
set_random_seed(cfg.seed)
def test(context_net, answer_net, loader, tracker, args, prefix='', epoch=0):
context_net.eval()
answer_net.eval()
tracker_class, tracker_params = tracker.MeanMonitor, {}
ans_ids, que_ids = [], []
accs, masks = [], []
tq = tqdm(loader, desc='{} E{:03d}'.format(prefix, epoch), ncols=0)
acc_tracker = tracker.track('{}_acc'.format(prefix), tracker_class(**tracker_params))
var_params = { 'volatile': True, 'requires_grad': False }
if args.answer_embedding == 'RNN':
answer_var, answer_len = loader.dataset._get_answer_sequences(range(cfg.TEST.max_answer_index))
else:
answer_var, answer_len = loader.dataset._get_answer_vectors(range(cfg.TEST.max_answer_index))
answer_var = Variable(answer_var.cuda(), **var_params)
answer_embedding = answer_net.forward(answer_var, answer_len)
cnt = 0
for v, q, _, _, labels, idx, q_len in tq:
v = Variable(v.cuda(), **var_params)
q = Variable(q.cuda(), **var_params)
q_len = Variable(q_len.cuda(), **var_params)
context_embedding = context_net(v, q, q_len)
predicts = cosine_sim(context_embedding, answer_embedding) / args.loss_temperature #temperature
acc = utils.batch_accuracy(predicts.data, labels.cuda()).cpu()
_, flag = labels.max(1)
flag = ( flag >= 2 ).byte()
masks.append(flag)
accs.append(acc.view(-1))
acc_tracker.append(acc.mean())
# collect stats
_, _ans_ids = predicts.data.cpu().max(dim=1)
ans_ids.append(_ans_ids.view(-1))
que_ids.append(idx.view(-1).clone())
fmt = '{:.4f}'.format
tq.set_postfix(acc=fmt(acc_tracker.mean.value))
return accs, masks, ans_ids, que_ids
def train(context_net, answer_net, loader, optimizer, tracker, args, prefix='', epoch=0):
""" Run an epoch over the given loader """
context_net.train()
answer_net.train()
tracker_class, tracker_params = tracker.MovingMeanMonitor, {'momentum': 0.99}
tq = tqdm(loader, desc='{} E{:03d}'.format(prefix, epoch), ncols=0)
loss_tracker = tracker.track('{}_loss'.format(prefix), tracker_class(**tracker_params))
acc_tracker = tracker.track('{}_acc'.format(prefix), tracker_class(**tracker_params))
lr_tracker = tracker.track('{}_lr'.format(prefix), tracker_class(**tracker_params))
var_params = { 'volatile': False, 'requires_grad': False, }
log_softmax = nn.LogSoftmax().cuda()
cnt = 0
start_tm=time.time()
for v, q, avocab, a, labels, idx, q_len in tq:
data_tm = time.time() - start_tm
start_tm=time.time()
if args.answer_embedding == 'RNN':
answer_var, answer_len = loader.dataset._get_answer_sequences(avocab)
else:
answer_var, answer_len = loader.dataset._get_answer_vectors(avocab)
answer_var = Variable(answer_var.cuda(), **var_params)
v = Variable(v.cuda(), **var_params)
q = Variable(q.cuda(), **var_params)
a = Variable(a.cuda(), **var_params)
q_len = Variable(q_len.cuda(), **var_params)
encode_tm = time.time() - start_tm
start_tm=time.time()
context_embedding = context_net(v, q, q_len)
answer_embedding = answer_net(answer_var, answer_len)
predicts = cosine_sim(context_embedding, answer_embedding) / args.loss_temperature #temperature
nll = -log_softmax(predicts)
loss = (nll * a / a.sum(1, keepdim=True)).sum(dim=1).mean()
acc = utils.batch_accuracy(predicts.data, a.data).cpu()
global total_iterations
lr = utils.update_learning_rate(optimizer, epoch)
optimizer.zero_grad()
loss.backward()
optimizer.step()
model_tm = time.time() - start_tm
start_tm=time.time()
loss_tracker.append(loss.data[0])
acc_tracker.append(acc.mean())
lr_tracker.append(lr)
fmt = '{:.6f}'.format
tq.set_postfix(loss=fmt(loss_tracker.mean.value), acc=fmt(acc_tracker.mean.value), lr=fmt(lr_tracker.mean.value), t_data=data_tm, t_model=model_tm, t_encode=encode_tm)
def main(args):
if args.name is None:
from datetime import datetime
name = args.context_embedding+"_"+args.answer_embedding+"_vqa_batch_softmax_embedding_"+datetime.now().strftime("%Y-%m-%d_%H:%M:%S")
name = ( name + '_finetune' ) if args.finetune else name
else:
name = args.context_embedding+"_"+args.answer_embedding+"_vqa_batch_softmax_embedding_"+args.name
output_filepath = os.path.join(cfg.output_path, '{}.pth'.format(name))
print('Output data would be saved to {}'.format(output_filepath))
word2vec = Vector()
train_loader = data.get_loader(word2vec, train=True)
val_loader = data.get_loader(word2vec, val=True)
question_word2vec = word2vec._prepare(train_loader.dataset.token_to_index)
if args.context_embedding == 'SAN':
context_net = model.StackedAttentionEmbedding(
train_loader.dataset.num_tokens,
question_word2vec).cuda()
elif args.context_embedding == 'BoW':
context_net = model.VisualSemanticEmbedding(
train_loader.dataset.num_tokens,
question_word2vec).cuda()
else:
raise TypeError('Unsupported Context Model')
if args.answer_embedding == 'BoW':
answer_net = model.MLPEmbedding(train_loader.dataset.vector.dim).cuda()
elif args.answer_embedding == 'RNN':
answer_net = model.RNNEmbedding(train_loader.dataset.vector.dim).cuda()
else:
raise TypeError('Unsupported Answer Model')
print('Context Model:')
print(context_net)
print('Answer Model:')
print(answer_net)
if args.pretrained_model is not None:
states = torch.load(args.pretrained_model)
answer_state, context_state = states['answer_net'], states['context_net']
answer_net.load_state_dict(answer_state)
context_net.load_state_dict(context_state)
params_for_optimization = list(context_net.parameters()) + list(answer_net.parameters())
optimizer = optim.Adam([p for p in params_for_optimization if p.requires_grad])
tracker = utils.Tracker()
if args.pretrained_model is not None:
accs, masks, ans_ids, que_ids = test(context_net, answer_net, val_loader, tracker, args, prefix='val', epoch=-1)
total_accs = torch.cat(accs)
total_masks = torch.cat(masks)
print('* VQA2 Val Accuracy: {}'.format(total_accs.mean()))
accs_ = total_accs[total_masks].sum()
print('* VQA2- Val Accuracy: {}'.format(accs_ / total_masks.sum()))
results = { 'name': name,
'eval': [{'answer_ids': ans_ids, 'question_ids': que_ids}],
'vocab': { 'answer_to_index': train_loader.dataset.answer_to_index,
'index_to_answer': train_loader.dataset.index_to_answer } }
print('* Dumpping output to: {}'.format(output_filepath))
torch.save(results, output_filepath)
if not args.finetune:
raise ValueError('Testing Finished')
best_val_acc = 0
best_context_net, best_answser_net = None, None
_eval = []
for i in range(cfg.TRAIN.epochs):
train(context_net, answer_net, train_loader, optimizer, tracker, args, prefix='train', epoch=i)
accs, _, ans_ids, que_ids = test(context_net, answer_net, val_loader, tracker, args, prefix='val', epoch=i)
_eval.append({ 'accuracies': accs, 'answer_ids': ans_ids, 'question_ids': que_ids })
val_acc = torch.mean( torch.cat(accs, dim=0) )
if best_val_acc < val_acc:
best_val_acc = val_acc
best_context_net = copy.deepcopy( context_net.state_dict() )
best_answer_net = copy.deepcopy( answer_net.state_dict() )
results = {
'name': name,
'tracker': tracker.to_dict(),
'config': cfg,
'context_net': best_context_net,
'answer_net': best_answer_net,
'eval': _eval,
'vocab': { 'answer_to_index': train_loader.dataset.answer_to_index,
'index_to_answer': train_loader.dataset.index_to_answer }
}
torch.save(results, output_filepath)
if __name__ == '__main__':
torch.cuda.set_device(args.gpu_id)
print(args.__dict__)
print(cfg)
update_train_configs(args)
main(args)