def load_mnist(path=".", normalize=True):
"""
Fetch the MNIST dataset and load it into memory.
Args:
path (str, optional): Local directory in which to cache the raw
dataset. Defaults to current directory.
normalize (bool, optional): whether to scale values between 0 and 1.
Defaults to True.
Returns:
tuple: Both training and test sets are returned.
"""
mnist = dataset_meta['mnist']
filepath = os.path.join(path, mnist['file'])
if not os.path.exists(filepath):
fetch_dataset(mnist['url'], mnist['file'], filepath, mnist['size'])
with gzip.open(filepath, 'rb') as mnist:
(X_train, y_train), (X_test, y_test) = cPickle.load(mnist)
# X_train = X_train.reshape(-1, 1, 28, 28)
# X_test = X_test.reshape(-1, 1, 28, 28)
X_train = X_train.reshape(-1, 784)
X_test = X_test.reshape(-1, 784)
# X_train = X_train[:, :100]
# X_test = X_test[:, :100]
if normalize:
X_train = X_train / 255.
X_test = X_test / 255.
return (X_train, y_train), (X_test, y_test), 10
def bleu_score(self, sents, targets):
"""
Compute the BLEU score from a list of predicted sentences and reference sentences
Args:
sents (list): list of predicted sentences
targets (list): list of reference sentences where each element is a list of
multiple references.
"""
num_ref = len(targets[0])
output_file = self.path + '/output'
reference_files = [
self.path + '/reference%d' % i for i in range(num_ref)
]
bleu_script_url = 'https://raw.githubusercontent.com/karpathy/neuraltalk/master/eval/'
bleu_script = 'multi-bleu.perl'
print "Writing output and reference sents to dir %s" % self.path
output_f = open(output_file, 'w+')
for sent in sents:
sent = sent.strip(self.end_token).split()
output_f.write(" ".join(sent) + '\n')
reference_f = [open(f, 'w') for f in reference_files]
for i in range(num_ref):
for target_sents in targets:
reference_f[i].write(target_sents[i] + '\n')
output_f.close()
[x.close() for x in reference_f]
owd = os.getcwd()
os.chdir(self.path)
if not os.path.exists(bleu_script):
fetch_dataset(bleu_script_url, bleu_script, bleu_script, 6e6)
bleu_command = 'perl multi-bleu.perl reference < output'
print "Executing bleu eval script: ", bleu_command
os.system(bleu_command)
os.chdir(owd)
def bleu_score(self, sents, targets):
"""
Compute the BLEU score from a list of predicted sentences and reference sentences
Args:
sents (list): list of predicted sentences
targets (list): list of reference sentences where each element is a list of
multiple references.
"""
num_ref = len(targets[0])
output_file = self.path + "/output"
reference_files = [self.path + "/reference%d" % i for i in range(num_ref)]
bleu_script_url = "https://raw.githubusercontent.com/karpathy/neuraltalk/master/eval/"
bleu_script = "multi-bleu.perl"
print "Writing output and reference sents to dir %s" % self.path
output_f = open(output_file, "w+")
for sent in sents:
sent = sent.strip(self.end_token).split()
output_f.write(" ".join(sent) + "\n")
reference_f = [open(f, "w") for f in reference_files]
for i in range(num_ref):
for target_sents in targets:
reference_f[i].write(target_sents[i] + "\n")
output_f.close()
[x.close() for x in reference_f]
owd = os.getcwd()
os.chdir(self.path)
if not os.path.exists(bleu_script):
fetch_dataset(bleu_script_url, bleu_script, bleu_script, 6e6)
bleu_command = "perl multi-bleu.perl reference < output"
print "Executing bleu eval script: ", bleu_command
os.system(bleu_command)
os.chdir(owd)