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improve demo/mnist dataProvider speed #713

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Merged
merged 2 commits into from
Dec 16, 2016
Merged

improve demo/mnist dataProvider speed #713

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ff4e046
improve demo/mnist dataProvider speed
Dec 2, 2016
828303b
after clang-format
Dec 15, 2016
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17 changes: 10 additions & 7 deletions demo/mnist/mnist_provider.py
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Original file line number Diff line number Diff line change
@@ -1,10 +1,12 @@
from paddle.trainer.PyDataProvider2 import *
import numpy


# Define a py data provider
@provider(
input_types={'pixel': dense_vector(28 * 28),
'label': integer_value(10)})
'label': integer_value(10)},
cache=CacheType.CACHE_PASS_IN_MEM)
def process(settings, filename): # settings is not used currently.
imgf = filename + "-images-idx3-ubyte"
labelf = filename + "-labels-idx1-ubyte"
Expand All @@ -20,12 +22,13 @@ def process(settings, filename): # settings is not used currently.
else:
n = 10000

for i in range(n):
label = ord(l.read(1))
pixels = []
for j in range(28 * 28):
pixels.append(float(ord(f.read(1))) / 255.0)
yield {"pixel": pixels, 'label': label}
images = numpy.fromfile(
f, 'ubyte', count=n * 28 * 28).reshape((n, 28 * 28)).astype('float32')
images = images / 255.0 * 2.0 - 1.0
labels = numpy.fromfile(l, 'ubyte', count=n).astype("int")

for i in xrange(n):
yield {"pixel": images[i, :], 'label': labels[i]}

f.close()
l.close()