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# Copyright 2017 The TensorFlow 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.
# ==============================================================================
"""Tests for the key functions in pruning library."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import numpy as np
from tensorflow.contrib.model_pruning.python import pruning
from tensorflow.python.framework import constant_op
from tensorflow.python.ops import math_ops
from tensorflow.python.ops import partitioned_variables
from tensorflow.python.ops import random_ops
from tensorflow.python.ops import state_ops
from tensorflow.python.ops import variable_scope
from tensorflow.python.ops import variables
from tensorflow.python.platform import test
from tensorflow.python.training import training_util
class PruningHParamsTest(test.TestCase):
PARAM_LIST = [
"name=test", "threshold_decay=0.9", "pruning_frequency=10",
"do_not_prune=[conv1,conv2]", "sparsity_function_end_step=100",
"target_sparsity=0.9"
]
TEST_HPARAMS = ",".join(PARAM_LIST)
def setUp(self):
super(PruningHParamsTest, self).setUp()
# Add global step variable to the graph
self.global_step = training_util.get_or_create_global_step()
# Add sparsity
self.sparsity = variables.Variable(0.5, name="sparsity")
# Parse hparams
self.pruning_hparams = pruning.get_pruning_hparams().parse(
self.TEST_HPARAMS)
def testInit(self):
p = pruning.Pruning(self.pruning_hparams)
self.assertEqual(p._spec.name, "test")
self.assertAlmostEqual(p._spec.threshold_decay, 0.9)
self.assertEqual(p._spec.pruning_frequency, 10)
self.assertAllEqual(p._spec.do_not_prune, ["conv1", "conv2"])
self.assertEqual(p._spec.sparsity_function_end_step, 100)
self.assertAlmostEqual(p._spec.target_sparsity, 0.9)
def testInitWithExternalSparsity(self):
with self.test_session():
p = pruning.Pruning(spec=self.pruning_hparams, sparsity=self.sparsity)
variables.global_variables_initializer().run()
sparsity = p._sparsity.eval()
self.assertAlmostEqual(sparsity, 0.5)
def testInitWithVariableReuse(self):
with self.test_session():
p = pruning.Pruning(spec=self.pruning_hparams, sparsity=self.sparsity)
p_copy = pruning.Pruning(
spec=self.pruning_hparams, sparsity=self.sparsity)
variables.global_variables_initializer().run()
sparsity = p._sparsity.eval()
self.assertAlmostEqual(sparsity, 0.5)
self.assertEqual(p._sparsity.eval(), p_copy._sparsity.eval())
class PruningTest(test.TestCase):
def setUp(self):
super(PruningTest, self).setUp()
self.global_step = training_util.get_or_create_global_step()
def testCreateMask2D(self):
width = 10
height = 20
with self.test_session():
weights = variables.Variable(
random_ops.random_normal([width, height], stddev=1), name="weights")
masked_weights = pruning.apply_mask(weights,
variable_scope.get_variable_scope())
variables.global_variables_initializer().run()
weights_val = weights.eval()
masked_weights_val = masked_weights.eval()
self.assertAllEqual(weights_val, masked_weights_val)
def testUpdateSingleMask(self):
with self.test_session() as session:
weights = variables.Variable(
math_ops.linspace(1.0, 100.0, 100), name="weights")
masked_weights = pruning.apply_mask(weights)
sparsity = variables.Variable(0.5, name="sparsity")
p = pruning.Pruning(sparsity=sparsity)
p._spec.threshold_decay = 0.0
mask_update_op = p.mask_update_op()
variables.global_variables_initializer().run()
masked_weights_val = masked_weights.eval()
self.assertAllEqual(np.count_nonzero(masked_weights_val), 100)
session.run(mask_update_op)
masked_weights_val = masked_weights.eval()
self.assertAllEqual(np.count_nonzero(masked_weights_val), 51)
def _blockMasking(self, hparams, weights, expected_mask):
threshold = variables.Variable(0.0, name="threshold")
sparsity = variables.Variable(0.51, name="sparsity")
test_spec = ",".join(hparams)
pruning_hparams = pruning.get_pruning_hparams().parse(test_spec)
# Set up pruning
p = pruning.Pruning(pruning_hparams, sparsity=sparsity)
with self.test_session():
variables.global_variables_initializer().run()
_, new_mask = p._maybe_update_block_mask(weights, threshold)
# Check if the mask is the same size as the weights
self.assertAllEqual(new_mask.get_shape(), weights.get_shape())
mask_val = new_mask.eval()
self.assertAllEqual(mask_val, expected_mask)
def testBlockMasking(self):
param_list = ["block_height=2", "block_width=2", "threshold_decay=0"]
weights_avg = constant_op.constant(
[[0.1, 0.1, 0.2, 0.2], [0.1, 0.1, 0.2, 0.2], [0.3, 0.3, 0.4, 0.4],
[0.3, 0.3, 0.4, 0.4]])
weights_max = constant_op.constant(
[[0.1, 0.0, 0.2, 0.0], [0.0, -0.1, 0.0, -0.2], [0.3, 0.0, 0.4, 0.0],
[0.0, -0.3, 0.0, -0.4]])
expected_mask = [[0, 0, 0, 0], [0, 0, 0, 0], [1, 1, 1, 1], [1, 1, 1, 1]]
self._blockMasking(param_list + ["block_pooling_function=MAX"], weights_max,
expected_mask)
self._blockMasking(param_list + ["block_pooling_function=AVG"],
weights_avg, expected_mask)
def testPartitionedVariableMasking(self):
partitioner = partitioned_variables.variable_axis_size_partitioner(40)
with self.test_session() as session:
with variable_scope.variable_scope("", partitioner=partitioner):
sparsity = variables.Variable(0.5, name="Sparsity")
weights = variable_scope.get_variable(
"weights", initializer=math_ops.linspace(1.0, 100.0, 100))
masked_weights = pruning.apply_mask(
weights, scope=variable_scope.get_variable_scope())
p = pruning.Pruning(sparsity=sparsity)
p._spec.threshold_decay = 0.0
mask_update_op = p.mask_update_op()
variables.global_variables_initializer().run()
masked_weights_val = masked_weights.eval()
session.run(mask_update_op)
masked_weights_val = masked_weights.eval()
self.assertAllEqual(np.count_nonzero(masked_weights_val), 51)
def testConditionalMaskUpdate(self):
param_list = [
"pruning_frequency=2", "begin_pruning_step=1", "end_pruning_step=6"
]
test_spec = ",".join(param_list)
pruning_hparams = pruning.get_pruning_hparams().parse(test_spec)
weights = variables.Variable(
math_ops.linspace(1.0, 100.0, 100), name="weights")
masked_weights = pruning.apply_mask(weights)
sparsity = variables.Variable(0.00, name="sparsity")
# Set up pruning
p = pruning.Pruning(pruning_hparams, sparsity=sparsity)
p._spec.threshold_decay = 0.0
mask_update_op = p.conditional_mask_update_op()
sparsity_val = math_ops.linspace(0.0, 0.9, 10)
increment_global_step = state_ops.assign_add(self.global_step, 1)
non_zero_count = []
with self.test_session() as session:
variables.global_variables_initializer().run()
for i in range(10):
session.run(state_ops.assign(sparsity, sparsity_val[i]))
session.run(mask_update_op)
session.run(increment_global_step)
non_zero_count.append(np.count_nonzero(masked_weights.eval()))
# Weights pruned at steps 0,2,4,and,6
expected_non_zero_count = [100, 100, 80, 80, 60, 60, 40, 40, 40, 40]
self.assertAllEqual(expected_non_zero_count, non_zero_count)
if __name__ == "__main__":
test.main()
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