from?__future__?import?print_function

from?six.moves?import?cPickle?as?pickle
import?numpy?as?np
import?os
from?scipy.misc?import?imread
import?platform

def?load_pickle（f）:
????version?=?platform.python_version_tuple（）
????if?version[0]?==?‘2‘:
????????return??pickle.load（f）
????elif?version[0]?==?‘3‘:
????????return??pickle.load（f?encoding=‘latin1‘）
????raise?ValueError（“invalid?python?version:?{}“.format（version））

def?load_CIFAR_batch（filename）:
??“““?load?single?batch?of?cifar?“““
??with?open（filename?‘rb‘）?as?f:
????datadict?=?load_pickle（f）
????X?=?datadict[‘data‘]
????Y?=?datadict[‘labels‘]
????X?=?X.reshape（10000?3?32?32）.transpose（0231）.astype（“float“）
????Y?=?np.array（Y）
????return?X?Y

def?load_CIFAR10（ROOT）:
??“““?load?all?of?cifar?“““
??xs?=?[]
??ys?=?[]
??for?b?in?range（16）:
????f?=?os.path.join（ROOT?‘data_batch_%d‘?%?（b?））
????X?Y?=?load_CIFAR_batch（f）
????xs.append（X）
????ys.append（Y）????
??Xtr?=?np.concatenate（xs）
??Ytr?=?np.concatenate（ys）
??del?X?Y
??Xte?Yte?=?load_CIFAR_batch（os.path.join（ROOT?‘test_batch‘））
??return?Xtr?Ytr?Xte?Yte


def?get_CIFAR10_data（num_training=49000?num_validation=1000?num_test=1000
?????????????????????subtract_mean=True）:
????“““
????Load?the?CIFAR-10?dataset?from?disk?and?perform?preprocessing?to?prepare
????it?for?classifiers.?These?are?the?same?steps?as?we?used?for?the?SVM?but
????condensed?to?a?single?function.
????“““
????#?Load?the?raw?CIFAR-10?data
????cifar10_dir?=?‘cs231n/datasets/cifar-10-batches-py‘
????X_train?y_train?X_test?y_test?=?load_CIFAR10（cifar10_dir）
????????
????#?Subsample?the?data
????mask?=?list（range（num_training?num_training?+?num_validation））
????X_val?=?X_train[mask]
????y_val?=?y_train[mask]
????mask?=?list（range（num_training））
????X_train?=?X_train[mask]
????y_train?=?y_train[mask]
????mask?=?list（range（num_test））
????X_test?=?X_test[mask]
????y_test?=?y_test[mask]

????#?Normalize?the?data:?subtract?the?mean?image
????if?subtract_mean:
??????mean_image?=?np.mean（X_train?axis=0）
??????X_train?-=?mean_image
??????X_val?-=?mean_image
??????X_test?-=?mean_image
????
????#?Transpose?so?that?channels?come?first
????X_train?=?X_train.transpose（0?3?1?2）.copy（）
????X_val?=?X_val.transpose（0?3?1?2）.copy（）
????X_test?=?X_test.transpose（0?3?1?2）.copy（）

????#?Package?data?into?a?dictionary
????return?{
??????‘X_train‘:?X_train?‘y_train‘:?y_train
??????‘X_val‘:?X_val?‘y_val‘:?y_val
??????‘X_test‘:?X_test?‘y_test‘:?y_test
????}
????

def?load_tiny_imagenet（path?dtype=np.float32?subtract_mean=True）:
??“““
??Load?TinyImageNet.?Each?of?TinyImageNet-100-A?TinyImageNet-100-B?and
??TinyImageNet-200?have?the?same?directory?structure?so?this?can?be?used
??to?load?any?of?them.

??Inputs:
??-?path:?String?giving?path?to?the?directory?to?load.
??-?dtype:?numpy?datatype?used?to?load?the?data.
??-?subtract_mean:?Whether?to?subtract?the?mean?training?image.

??Returns:?A?dictionary?with?the?following?entries:
??-?class_names:?A?list?where?class_na

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-09-11?17:26??CS231-master\
?????文件????????2729??2017-09-11?17:26??CS231-master\README.md
?????文件??????????26??2017-09-11?17:26??CS231-master\_config.yml
?????目錄???????????0??2017-09-11?17:26??CS231-master\assignment1\
?????文件?????????130??2017-09-11?17:26??CS231-master\assignment1\README.md
?????文件????????2743??2017-09-11?17:26??CS231-master\assignment1\Untitled.ipynb
?????文件?????????169??2017-09-11?17:26??CS231-master\assignment1\collectSubmission.sh
?????目錄???????????0??2017-09-11?17:26??CS231-master\assignment1\cs231n\
?????目錄???????????0??2017-09-11?17:26??CS231-master\assignment1\cs231n\__pycache__\
?????文件?????????167??2017-09-11?17:26??CS231-master\assignment1\cs231n\__pycache__\__init__.cpython-36.pyc
?????文件????????7083??2017-09-11?17:26??CS231-master\assignment1\cs231n\__pycache__\data_utils.cpython-36.pyc
?????文件????????4401??2017-09-11?17:26??CS231-master\assignment1\cs231n\__pycache__\features.cpython-36.pyc
?????文件????????3693??2017-09-11?17:26??CS231-master\assignment1\cs231n\__pycache__\gradient_check.cpython-36.pyc
?????文件????????2328??2017-09-11?17:26??CS231-master\assignment1\cs231n\__pycache__\vis_utils.cpython-36.pyc
?????目錄???????????0??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\
?????文件?????????103??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\__init__.py
?????目錄???????????0??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\__pycache__\
?????文件?????????281??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\__pycache__\__init__.cpython-36.pyc
?????文件????????4977??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\__pycache__\k_nearest_neighbor.cpython-36.pyc
?????文件????????4234??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\__pycache__\linear_classifier.cpython-36.pyc
?????文件????????2267??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\__pycache__\linear_svm.cpython-36.pyc
?????文件????????6538??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\__pycache__\neural_net.cpython-36.pyc
?????文件????????2269??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\__pycache__\softmax.cpython-36.pyc
?????文件????????8250??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\k_nearest_neighbor.py
?????文件????????6217??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\linear_classifier.py
?????文件????????5312??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\linear_svm.py
?????文件???????11183??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\neural_net.py
?????文件????????3953??2017-09-11?17:26??CS231-master\assignment1\cs231n\classifiers\softmax.py
?????文件????????7782??2017-09-11?17:26??CS231-master\assignment1\cs231n\data_utils.py
?????目錄???????????0??2017-09-11?17:26??CS231-master\assignment1\cs231n\datasets\
?????文件?????????134??2017-09-11?17:26??CS231-master\assignment1\cs231n\datasets\get_datasets.sh
............此處省略132個文件信息