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dataloader.py
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dataloader.py
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from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from joblib import Parallel, delayed
import json
import h5py
import os
import warnings
warnings.filterwarnings('ignore')
import tables
# import multiprocessing
# from multiprocessing import Process
# from multiprocessing.dummy import Pool as ThreadPool
# from pathos.multiprocessing import Pool
# import pathos.pools as pp
import numpy as np
import random
import torch
from torchvision import transforms as trn
preprocess = trn.Compose([
#trn.ToTensor(),
trn.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
])
# def unwrap_self(args):
# cls, arg = args
# return cls.get_batch_one(arg)
def func(*args, **kwargs):
return DataLoader.get_batch_one(args, kwargs)
def get_img(args):
h5_image_file, ix = args
temp_h5 = tables.open_file(h5_image_file, mode='r')
img = np.array(temp_h5.root.images[ix, :, :, :])
img_batch = preprocess(torch.from_numpy(img.astype('float32') / 255.0)).numpy()
temp_h5.close()
return img_batch
def get_sen_embed(args):
h5_sen_file, sen_ix = args
temp_h5 = h5py.File(h5_sen_file, mode='r')
sen_embed = np.stack(temp_h5['average'][sen_ix, :]).transpose()
temp_h5.close()
return sen_embed
def combine(args):
h5_image_file, ix, h5_sen_file, sen_ix = args
arg1 = h5_image_file, ix
arg2 = h5_sen_file, sen_ix
img = get_img(arg1)
sen = get_sen_embed(arg2)
return img, sen
class DataLoader:
def __init__(self, opt):
self.opt = opt
self.batch_size = self.opt.batch_size
self.seq_per_img = self.opt.seq_per_img
self.num_thread = 1
# load the json file which contains additional information about the dataset
print('DataLoader loading json file: ', opt.input_json)
self.info = json.load(open(self.opt.input_json))
self.ix_to_word = self.info['ix_to_word']
self.vocab_size = len(self.ix_to_word)
print('vocab size is ', self.vocab_size)
# open the hdf5 file
print('DataLoader loading h5 file: ', opt.input_label_h5, opt.input_image_h5)
# self.h5_label_file = h5py.File(self.opt.input_label_h5, mode='r')
self.h5_label_file = tables.open_file(self.opt.input_label_h5, driver="H5FD_CORE")
# self.h5_image_file = h5py.File(self.opt.input_image_h5, mode='r')
self.h5_image_file = tables.open_file(self.opt.input_image_h5, mode='r')
if 'sentence_embed' in opt:
if opt.sentence_embed:
self.h5_sen_embed_file = h5py.File(self.opt.sentence_embed, mode='r')
# self.h5_sen_embed_file = tables.open_file(self.opt.sentence_embed, mode='r')
self.sen_embed_keys = json.load(open(self.opt.sentence_embed.split('.h5')[0] + '_keys.json'))
# self.sen_embed_file = da.from_array(self.h5_sen_embed_file['average'],
# chunks=(self.h5_sen_embed_file['average'].shape[0], 300, ))
else:
self.opt.sentence_embed = False
# extract image size from dataset
# images_size = self.h5_image_file['images'].shape
images_size = self.h5_image_file.root.images.shape
assert len(images_size) == 4, 'images should be a 4D tensor'
assert images_size[2] == images_size[3], 'width and height must match'
self.num_images = images_size[0]
self.num_channels = images_size[1]
self.max_image_size = images_size[2]
print('read %d images of size %dx%dx%d' %(self.num_images,
self.num_channels, self.max_image_size, self.max_image_size))
# load in the sequence data
# seq_size = self.h5_label_file['labels'].shape
seq_size = self.h5_label_file.root.labels.shape
self.seq_length = seq_size[1]
print('max sequence length in data is', self.seq_length)
# load the pointers in full to RAM (should be small enough)
self.label_start_ix = np.array(self.h5_label_file.root.label_start_ix)
# self.label_start_ix = np.array(self.h5_label_file['label_start_ix'])
self.label_end_ix = np.array(self.h5_label_file.root.label_end_ix)
# self.label_end_ix = np.array(self.h5_label_file['label_end_ix'])
# separate out indexes for each of the provided splits
self.split_ix = {'train': [], 'val': [], 'test': []}
# TODO: for nytimes dataset
self.id_to_keys = {i['id']: i['file_path'].split('/')[1].split('_')[0] for i in self.info['images']}
# TODO: for breakinNews
# self.id_to_keys = {i['id']: i['id'] for i in self.info['images']}
for ix in range(len(self.info['images'])):
img = self.info['images'][ix]
if img['split'] == 'train':
self.split_ix['train'].append(ix)
elif img['split'] == 'val':
self.split_ix['val'].append(ix)
elif img['split'] == 'test':
self.split_ix['test'].append(ix)
elif opt.train_only == 0: # restval
self.split_ix['train'].append(ix)
print('assigned %d images to split train' % len(self.split_ix['train']))
print('assigned %d images to split val' % len(self.split_ix['val']))
print('assigned %d images to split test' % len(self.split_ix['test']))
self.iterators = {'train': 0, 'val': 0, 'test': 0}
self.shuffle = {'train': np.random.permutation(np.arange(len(self.split_ix['train']))),
'val': np.arange(len(self.split_ix['val'])),
'test': np.arange(len(self.split_ix['test']))}
def __len__(self):
return len(self.split_ix['train'])
def get_vocab_size(self):
return self.vocab_size
def get_vocab(self):
return self.ix_to_word
def get_seq_length(self):
return self.seq_length
def get_batch_one(self, split):
split_ix = self.split_ix[split]
batch_size = 1
img_batch = np.ndarray([batch_size, 3, 256, 256], dtype='float32')
label_batch = np.zeros([batch_size * self.seq_per_img, self.seq_length + 2], dtype='int')
mask_batch = np.zeros([batch_size * self.seq_per_img, self.seq_length + 2], dtype='float32')
if self.opt.sentence_embed:
sen_embed_batch = np.zeros(
[batch_size * self.seq_per_img, self.opt.sentence_length + 1, self.opt.sentence_embed_size],
dtype='float32')
max_index = len(split_ix)
infos = []
b_id = self.shuffle[split][self.iterators[split]: self.iterators[split] + batch_size][0]
self.iterators[split] += batch_size
if self.iterators[split] >= max_index:
np.random.shuffle(self.shuffle[split])
self.iterators[split] = 0
i=0
ix = split_ix[b_id]
# fetch image
# img = self.load_image(self.image_info[ix]['filename'])
# img = np.array(self.h5_image_file['images'][ix, :, :, :])
img = np.array(self.h5_image_file.root.images[ix, :, :, :])
img_batch[i] = preprocess(torch.from_numpy(img.astype('float32') / 255.0)).numpy()
# fetch the sequence labels
ix1 = self.label_start_ix[ix] - 1 # label_start_ix starts from 1
ix2 = self.label_end_ix[ix] - 1
ncap = ix2 - ix1 + 1 # number of captions available for this image
assert ncap > 0, 'an image does not have any label. this can be handled but right now isn\'t'
if ncap < self.seq_per_img:
# we need to subsample (with replacement)
seq = np.zeros([self.seq_per_img, self.seq_length], dtype='int')
for q in range(self.seq_per_img):
ixl = random.randint(ix1, ix2)
# seq[q, :] = self.h5_label_file['labels'][ixl, :self.seq_length]
seq[q, :] = self.h5_label_file.root.labels[ixl, :self.seq_length]
else:
ixl = random.randint(ix1, ix2 - self.seq_per_img + 1)
# seq = self.h5_label_file['labels'][ixl: ixl + self.seq_per_img, :self.seq_length]
seq = self.h5_label_file.root.labels[ixl: ixl + self.seq_per_img, :self.seq_length]
label_batch[i * self.seq_per_img: (i + 1) * self.seq_per_img, 1: self.seq_length + 1] = seq
# record associated info as well
info_dict = {}
info_dict['id'] = self.info['images'][ix]['id']
info_dict['file_path'] = self.info['images'][ix]['file_path']
# fetch sen_embed
if self.opt.sentence_embed:
# for q in range(self.seq_per_img):
key = self.id_to_keys[info_dict['id']]
sen_ix = self.sen_embed_keys.index(key)
sen_embed = np.stack(self.h5_sen_embed_file['average'][sen_ix, :]).transpose()
# sen_embed = np.stack(self.h5_sen_embed_file.root.average[sen_ix, :]).transpose()
sen_embed_batch[i, :len(sen_embed), :] = sen_embed
infos.append(info_dict)
# generate mask
nonzeros = np.array(list(map(lambda x: (x != 0).sum() + 2, label_batch)))
for ix, row in enumerate(mask_batch):
row[:nonzeros[ix]] = 1
data = {}
if self.opt.sentence_embed:
data['sen_embed'] = sen_embed_batch
data['images'] = img_batch
data['labels'] = label_batch
data['masks'] = mask_batch
data['bounds'] = {'it_pos_now': self.iterators[split], 'it_max': len(split_ix)}
data['infos'] = infos
return data
def __call__(self, split):
return self.get_batch_one(split)
def get_batch(self, split, batch_size=None):
split_ix = self.split_ix[split]
batch_size = batch_size or self.batch_size
# img_batch = np.ndarray([batch_size, 3, 256, 256], dtype='float32')
label_batch = np.zeros([batch_size * self.seq_per_img, self.seq_length + 2], dtype='int')
mask_batch = np.zeros([batch_size * self.seq_per_img, self.seq_length + 2], dtype='float32')
# if self.opt.sentence_embed:
# sen_embed_batch = np.zeros(
# [batch_size * self.seq_per_img, self.opt.sentence_length + 1, self.opt.sentence_embed_size],
# dtype='float32')
max_index = len(split_ix)
wrapped = False
infos = []
# temp_img_h5 = tables.open_file(self.opt.input_image_h5, mode='r')
# Parallel(n_jobs=self.num_thread, verbose=0, backend="loky")(map(delayed(self.get_batch_one),
# range(self.batch_size)))
batch_ids = self.shuffle[split][self.iterators[split]: self.iterators[split]+batch_size].tolist()
self.iterators[split] += batch_size
if self.iterators[split] >= max_index:
if split=='train':
np.random.shuffle(self.shuffle[split])
self.iterators[split] = 0
wrapped = True
if len(batch_ids) != batch_size:
leftover = batch_size - len(batch_ids)
batch_ids.extend(self.shuffle[split][self.iterators[split]: self.iterators[split]+leftover])
self.iterators[split] += leftover
#combine
if self.opt.sentence_embed:
keys = [self.id_to_keys[self.info['images'][i]['id']] for i, b_id in enumerate(batch_ids)]
sen_ixs = [self.sen_embed_keys.index(key) for key in keys]
combined = Parallel(n_jobs=self.num_thread, verbose=0, backend="loky")(
map(delayed(combine), [(self.opt.input_image_h5, split_ix[b_id], self.opt.sentence_embed, s
) for b_id, s in zip(batch_ids, sen_ixs)]))
img_batch = [c[0] for c in combined]
sen = [c[1] for c in combined]
if vars(self.opt).get('sentence_embed_method', None) == 'fc' or \
vars(self.opt).get('sentence_embed_method', None) == 'fc_max':
sen_embed_batch = [np.pad(a, ((0, self.opt.sentence_length + 1 - len(a)), (0, 0)),
'constant', constant_values=0) for a in sen]
else:
sen_embed_batch = [np.pad(a, ((0, self.opt.sentence_length - len(a)), (0, 0)),
'constant', constant_values=0) if len(a)<self.opt.sentence_length else a[:self.opt.sentence_length] for a in sen]
sen_embed_batch = np.array(sen_embed_batch, dtype=np.float32)
else:
# combined = Parallel(n_jobs=self.num_thread, verbose=0, backend="loky")(
# map(delayed(get_img), [(self.opt.input_image_h5, split_ix[b_id]) for b_id in batch_ids]))
img_batch = [get_img((self.opt.input_image_h5, split_ix[b_id])) for b_id in batch_ids]
img_batch = np.array(img_batch)
for i, b_id in enumerate(batch_ids):
# for i in range(batch_size):
# ri = self.iterators[split]
# ri_next = ri + 1
# if ri_next >= max_index:
# np.random.shuffle(self.shuffle[split])
# ri_next = 0
# wrapped = True
# self.iterators[split] = ri_next
# ix = split_ix[ri]
ix = split_ix[b_id]
# fetch image
# img = self.load_image(self.image_info[ix]['filename'])
# img = np.array(self.h5_image_file['images'][ix, :, :, :])
# img = np.array(self.h5_image_file.root.images[ix, :, :, :])
# img_batch[i] = preprocess(torch.from_numpy(img.astype('float32')/255.0)).numpy()
# fetch the sequence labels
ix1 = self.label_start_ix[ix] - 1 #label_start_ix starts from 1
ix2 = self.label_end_ix[ix] - 1
ncap = ix2 - ix1 + 1 # number of captions available for this image
assert ncap > 0, 'an image does not have any label. this can be handled but right now isn\'t'
if ncap < self.seq_per_img:
# we need to subsample (with replacement)
seq = np.zeros([self.seq_per_img, self.seq_length], dtype = 'int')
for q in range(self.seq_per_img):
ixl = random.randint(ix1,ix2)
# seq[q, :] = self.h5_label_file['labels'][ixl, :self.seq_length]
seq[q, :] = self.h5_label_file.root.labels[ixl, :self.seq_length]
else:
ixl = random.randint(ix1, ix2 - self.seq_per_img + 1)
# seq = self.h5_label_file['labels'][ixl: ixl + self.seq_per_img, :self.seq_length]
seq = self.h5_label_file.root.labels[ixl: ixl + self.seq_per_img, :self.seq_length]
label_batch[i * self.seq_per_img : (i + 1) * self.seq_per_img, 1 : self.seq_length + 1] = seq
# record associated info as well
info_dict = {}
info_dict['id'] = self.info['images'][ix]['id']
info_dict['file_path'] = self.info['images'][ix]['file_path']
# fetch sen_embed
# if self.opt.sentence_embed:
# # for q in range(self.seq_per_img):
# key = self.id_to_keys[info_dict['id']]
# sen_ix = self.sen_embed_keys.index(key)
# sen_embed = np.stack(self.h5_sen_embed_file['average'][sen_ix, :]).transpose()
# # sen_embed = np.stack(self.h5_sen_embed_file.root.average[sen_ix, :]).transpose()
# sen_embed_batch[i, :len(sen_embed), :] = sen_embed
infos.append(info_dict)
# generate mask
nonzeros = np.array(list(map(lambda x: (x != 0).sum()+2, label_batch)))
for ix, row in enumerate(mask_batch):
row[:nonzeros[ix]] = 1
data = {}
if self.opt.sentence_embed:
data['sen_embed'] = sen_embed_batch
data['images'] = img_batch
data['labels'] = label_batch
data['masks'] = mask_batch
data['bounds'] = {'it_pos_now': self.iterators[split], 'it_max': len(split_ix), 'wrapped': wrapped}
data['infos'] = infos
return data
def reset_iterator(self, split):
self.iterators[split] = 0