“““expand_mnist.py
~~~~~~~~~~~~~~~~~~

Take?the?50000?MNIST?training?images?and?create?an?expanded?set?of
250000?images?by?displacing?each?training?image?up?down?left?and
right?by?one?pixel.??Save?the?resulting?file?to
../data/mnist_expanded.pkl.gz.

Note?that?this?program?is?memory?intensive?and?may?not?run?on?small
systems.

“““

from?__future__?import?print_function

####?Libraries

#?Standard?library
import?cPickle
import?gzip
import?os.path
import?random

#?Third-party?libraries
import?numpy?as?np

print（“Expanding?the?MNIST?training?set“）

if?os.path.exists（“../data/mnist_expanded.pkl.gz“）:
????print（“The?expanded?training?set?already?exists.??Exiting.“）
else:
????f?=?gzip.open（“../data/mnist.pkl.gz“?‘rb‘）
????training_data?validation_data?test_data?=?cPickle.load（f）
????f.close（）
????expanded_training_pairs?=?[]
????j?=?0?#?counter
????for?x?y?in?zip（training_data[0]?training_data[1]）:
????????expanded_training_pairs.append（（x?y））
????????image?=?np.reshape（x?（-1?28））
????????j?+=?1
????????if?j?%?1000?==?0:?print（“Expanding?image?number“?j）
????????#?iterate?over?data?telling?us?the?details?of?how?to
????????#?do?the?displacement
????????for?d?axis?index_position?index?in?[
????????????????（1??0?“first“?0）
????????????????（-1?0?“first“?27）
????????????????（1??1?“last“??0）
????????????????（-1?1?“last“??27）]:
????????????new_img?=?np.roll（image?d?axis）
????????????if?index_position?==?“first“:?
????????????????new_img[index?:]?=?np.zeros（28）
????????????else:?
????????????????new_img[:?index]?=?np.zeros（28）
????????????expanded_training_pairs.append（（np.reshape（new_img?784）?y））
????random.shuffle（expanded_training_pairs）
????expanded_training_data?=?[list（d）?for?d?in?zip（*expanded_training_pairs）]
????print（“Saving?expanded?data.?This?may?take?a?few?minutes.“）
????f?=?gzip.open（“../data/mnist_expanded.pkl.gz“?“w“）
????cPickle.dump（（expanded_training_data?validation_data?test_data）?f）
????f.close（）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-04-19?05:36??DeepLearningPython35-master\
?????文件??????????12??2018-04-19?05:36??DeepLearningPython35-master\.gitignore
?????文件??????492526??2018-04-19?05:36??DeepLearningPython35-master\MyNetwork
?????文件?????????619??2018-04-19?05:36??DeepLearningPython35-master\README.md
?????文件????????1982??2018-04-19?05:36??DeepLearningPython35-master\expand_mnist.py
?????文件????17051982??2018-04-19?05:36??DeepLearningPython35-master\mnist.pkl.gz
?????文件????????2673??2018-04-19?05:36??DeepLearningPython35-master\mnist_average_darkness.py
?????文件????????3425??2018-04-19?05:36??DeepLearningPython35-master\mnist_loader.py
?????文件?????????770??2018-04-19?05:36??DeepLearningPython35-master\mnist_svm.py
?????文件????????6399??2018-04-19?05:36??DeepLearningPython35-master\network.py
?????文件???????15252??2018-04-19?05:36??DeepLearningPython35-master\network2.py
?????文件???????13000??2018-04-19?05:36??DeepLearningPython35-master\network3.py
?????文件????????7394??2018-04-19?05:36??DeepLearningPython35-master\test.py