File size: 3,270 Bytes
4b876a7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | # Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import io
import random
import paddle.utils.image_util as image_util
from paddle.trainer.PyDataProvider2 import *
#
# {'img_size': 32,
# 'settings': <paddle.trainer.PyDataProviderWrapper.Cls instance at 0x7fea27cb6050>,
# 'color': True,
# 'mean_img_size': 32,
# 'meta': './data/cifar-out/batches/batches.meta',
# 'num_classes': 10,
# 'file_list': ('./data/cifar-out/batches/train_batch_000',),
# 'use_jpeg': True}
def hook(settings, img_size, mean_img_size, num_classes, color, meta, use_jpeg,
is_train, **kwargs):
settings.mean_img_size = mean_img_size
settings.img_size = img_size
settings.num_classes = num_classes
settings.color = color
settings.is_train = is_train
if settings.color:
settings.img_raw_size = settings.img_size * settings.img_size * 3
else:
settings.img_raw_size = settings.img_size * settings.img_size
settings.meta_path = meta
settings.use_jpeg = use_jpeg
settings.img_mean = image_util.load_meta(settings.meta_path,
settings.mean_img_size,
settings.img_size, settings.color)
settings.logger.info('Image size: %s', settings.img_size)
settings.logger.info('Meta path: %s', settings.meta_path)
settings.input_types = [
dense_vector(settings.img_raw_size), # image feature
integer_value(settings.num_classes)
] # labels
settings.logger.info('DataProvider Initialization finished')
@provider(init_hook=hook, min_pool_size=0)
def processData(settings, file_list):
"""
The main function for loading data.
Load the batch, iterate all the images and labels in this batch.
file_list: the batch file list.
"""
with open(file_list, 'r') as fdata:
lines = [line.strip() for line in fdata]
random.shuffle(lines)
for file_name in lines:
with io.open(file_name.strip(), 'rb') as file:
data = cPickle.load(file)
indexes = list(range(len(data['images'])))
if settings.is_train:
random.shuffle(indexes)
for i in indexes:
if settings.use_jpeg == 1:
img = image_util.decode_jpeg(data['images'][i])
else:
img = data['images'][i]
img_feat = image_util.preprocess_img(
img, settings.img_mean, settings.img_size,
settings.is_train, settings.color)
label = data['labels'][i]
yield img_feat.astype('float32'), int(label)
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