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dataset.py
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dataset.py
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import torch.utils.data as data
from PIL import Image
import os
import os.path
import numpy as np
from numpy.random import randint
class VideoRecord(object):
def __init__(self, row):
self._data = row
@property
def path(self):
return self._data[0]
@property
def num_frames(self):
return int(self._data[1])
@property
def label(self):
return int(self._data[2])
class TSNDataSet(data.Dataset):
def __init__(self, root_path, list_file,
num_segments=3, new_length=1, interval=2, modality='RGB', mode=1, stride=8,
image_tmpl='img_{:05d}.jpg', transform=None,
force_grayscale=False, random_shift=True, test_mode=False):
self.root_path = root_path
self.list_file = list_file
self.num_segments = num_segments
self.new_length = new_length
self.modality = modality
self.image_tmpl = image_tmpl
self.transform = transform
self.random_shift = random_shift
self.test_mode = test_mode
self.interval= interval
self.mode = mode
self.stride = stride
if self.modality == 'RGBDiff':
self.new_length += 1# Diff needs one more image to calculate diff
self._parse_list()
def _load_image(self, directory, idx):
if self.modality == 'RGB' or self.modality == 'RGBDiff':
return [Image.open(os.path.join(directory, self.image_tmpl.format(idx))).convert('RGB')]
elif self.modality == 'Flow':
img = Image.open(os.path.join(directory, self.image_tmpl.format(idx))).convert('RGB')
flow_x, flow_y, _ = img.split()
x_img = flow_x.convert('L')
y_img = flow_y.convert('L')
# x_img = Image.open(os.path.join(directory, self.image_tmpl.format('x', idx))).convert('L')
# y_img = Image.open(os.path.join(directory, self.image_tmpl.format('y', idx))).convert('L')
return [x_img, y_img]
def _parse_list(self):
self.video_list = [VideoRecord(x.strip().split(' ')) for x in open(self.list_file)]
def _sample_indices(self, record):
"""
:param record: VideoRecord
:return: list
"""
if not (self.mode): # i3d dense sample
sample_pos = max(1, 1 + record.num_frames - 64)
t_stride = 64 // self.num_segments
start_idx = 0 if sample_pos == 1 else np.random.randint(0, sample_pos - 1)
offsets = [(idx * t_stride + start_idx) % record.num_frames for idx in range(self.num_segments)]
# print (offsets)
return np.array(offsets) + 1
else: # normal sample
average_duration = (record.num_frames - self.new_length + 1) // self.num_segments
if average_duration > 0:
offsets = np.multiply(list(range(self.num_segments)), average_duration) + randint(average_duration,
size=self.num_segments)
elif record.num_frames > self.num_segments:
offsets = np.sort(randint(record.num_frames - self.new_length + 1, size=self.num_segments))
else:
offsets = np.zeros((self.num_segments,))
# print (offsets)
return offsets + 1
def _get_val_indices(self, record):
if (self.mode==0): # i3d dense sample
sample_pos = max(1, 1 + record.num_frames - 64)
t_stride = 64 // self.num_segments
start_idx = 0 if sample_pos == 1 else np.random.randint(0, sample_pos - 1)
offsets = [(idx * t_stride + start_idx) % record.num_frames for idx in range(self.num_segments)]
return np.array(offsets) + 1
else:
if record.num_frames > self.num_segments + self.new_length - 1:
tick = (record.num_frames - self.new_length + 1) / float(self.num_segments)
offsets = np.array([int(tick / 2.0 + tick * x) for x in range(self.num_segments)])
else:
offsets = np.zeros((self.num_segments,))
return offsets + 1
def _get_test_indices(self, record):
if (self.mode==0):
sample_pos = max(1, 1 + record.num_frames - 64)
t_stride = 64 // self.num_segments
start_list = np.linspace(0, sample_pos - 1, num=10, dtype=int)
offsets = []
for start_idx in start_list.tolist():
offsets += [(idx * t_stride + start_idx) % record.num_frames for idx in range(self.num_segments)]
return np.array(offsets) + 1
else:
tick = (record.num_frames - self.new_length + 1) / float(self.num_segments)
offsets = np.array([int(tick / 2.0 + tick * x) for x in range(self.num_segments)])
return offsets + 1
def __getitem__(self, index):
record = self.video_list[index]
if not self.test_mode:
segment_indices = self._sample_indices(record) if self.random_shift else self._get_val_indices(record)
# print (segment_indices)
else:
segment_indices = self._get_test_indices(record)
# print (segment_indices)
return self.get(record, segment_indices)
def get(self, record, indices):
images = list()
for seg_ind in indices:
p = int(seg_ind)
for i in range(self.new_length):
seg_imgs = self._load_image(record.path, p)
images.extend(seg_imgs)
if p < record.num_frames:
p += 1
process_data, _ = self.transform((images,record.label))
return process_data, record.label
def __len__(self):
return len(self.video_list)