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Implementation of adjust_contrast op.

master
shugeo 2019-09-30 18:24:12 +03:00
parent f98f8be7b6
commit e06dfb5dcc
3 changed files with 119 additions and 0 deletions
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68
libnd4j/include/ops/declarable/generic/parity_ops/adjust_contrast.cpp Normal file
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@ -0,0 +1,68 @@
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
//
// @author George A. Shulinok <sgazeos@gmail.com>
//
#include <op_boilerplate.h>
#if NOT_EXCLUDED(OP_adjust_contrast)
#include <ops/declarable/headers/parity_ops.h>
#include <NDArrayFactory.h>
namespace nd4j {
namespace ops {
CONFIGURABLE_OP_IMPL(adjust_contrast, 1, 1, true, 1, 0) {
auto input = INPUT_VARIABLE(0);
auto output = OUTPUT_VARIABLE(0);
const double factor = T_ARG(0);
REQUIRE_TRUE(input->rankOf() > 2, 0, "ADJUST_CONTRAST: op expects rank of input array to be >= 3, but got %i instead", input->rankOf());
REQUIRE_TRUE(input->sizeAt(-1) == 3, 0, "ADJUST_CONTRAST: operation expects image with 3 channels (R, G, B), but got %i instead", input->sizeAt(-1));
// compute mean before
reduce_mean meanOp;
auto axes = NDArrayFactory::create<int>('c', {input->rankOf() - 1}, block.launchContext());
for (int i = 0; i < input->rankOf() -1; i++)
axes.p(i, i);
auto meanRes = meanOp.execute({input, &axes}, {}, {});
REQUIRE_TRUE(meanRes->status() == Status::OK(), 0, "ADJUST_CONTRAST: op should be successful, but error code %i occured.", meanRes->status());
auto mean = meanRes->at(0);
NDArray factorT(output->dataType(), block.launchContext()); // = NDArrayFactory::create(factor, block.launchContext());
factorT.p(0, factor);
// this is contrast calculation
*output = (*input - *mean) * factorT + *mean;
delete meanRes;
return Status::OK();
}
DECLARE_TYPES(adjust_contrast) {
getOpDescriptor()->setAllowedInputTypes(nd4j::DataType::ANY)
->setAllowedOutputTypes({ALL_FLOATS})
->setSameMode(true);
}
}
}
#endif

15
libnd4j/include/ops/declarable/headers/parity_ops.h
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@ -600,6 +600,21 @@ namespace nd4j {
DECLARE_CONFIGURABLE_OP(adjust_saturation, 1, 1, true, 1, -2);
#endif
/**
* This operation adjusts image contrast by given factor ( z = (x - mean) * factor + mean )
* Input arrays:
* 0 - input array with rank >= 3, must have last one dimension equal 3, that is dimension containing channels.
*
* T arguments:
* 0 - contrast factor
*
*/
#if NOT_EXCLUDED(OP_adjust_contrast)
DECLARE_CONFIGURABLE_OP(adjust_contrast, 1, 1, true, 1, 0);
#endif
/**
* This operation rearranges data from depth into blocks of spatial data. This is the reverse transformation

36
libnd4j/tests_cpu/layers_tests/DeclarableOpsTests15.cpp
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@ -157,6 +157,42 @@ TEST_F(DeclarableOpsTests15, Test_standarize_bp_1) {
delete result;
}
TEST_F(DeclarableOpsTests15, Test_AdjustContrast_1) {
auto x = NDArrayFactory::create<double>('c', {4,4,3});
auto e = NDArrayFactory::create<double>('c', {4,4,3}, {
-21.5, -20.5, -19.5, -15.5, -14.5, -13.5, -9.5, -8.5, -7.5, -3.5, -2.5, -1.5,
2.5, 3.5, 4.5, 8.5, 9.5, 10.5, 14.5, 15.5, 16.5, 20.5, 21.5, 22.5,
26.5, 27.5, 28.5, 32.5, 33.5, 34.5, 38.5, 39.5, 40.5, 44.5, 45.5, 46.5,
50.5, 51.5, 52.5, 56.5, 57.5, 58.5, 62.5, 63.5, 64.5, 68.5, 69.5, 70.5
});
x.linspace(1.);
nd4j::ops::adjust_contrast op;
auto result = op.execute({&x}, {2.}, {}, {});
ASSERT_EQ(Status::OK(), result->status());
auto out = result->at(0);
// out->printIndexedBuffer("Adjusted Constrast");
ASSERT_TRUE(e.equalsTo(out));
delete result;
}
TEST_F(DeclarableOpsTests15, Test_AdjustContrast_2) {
auto x = NDArrayFactory::create<float>('c', {1, 4,4,3});
auto e = NDArrayFactory::create<float>('c', {1, 4,4,3}, {
-21.5, -20.5, -19.5, -15.5, -14.5, -13.5, -9.5, -8.5, -7.5, -3.5, -2.5, -1.5,
2.5, 3.5, 4.5, 8.5, 9.5, 10.5, 14.5, 15.5, 16.5, 20.5, 21.5, 22.5,
26.5, 27.5, 28.5, 32.5, 33.5, 34.5, 38.5, 39.5, 40.5, 44.5, 45.5, 46.5,
50.5, 51.5, 52.5, 56.5, 57.5, 58.5, 62.5, 63.5, 64.5, 68.5, 69.5, 70.5
});
x.linspace(1.);
nd4j::ops::adjust_contrast op;
auto result = op.execute({&x}, {2.}, {}, {});
ASSERT_EQ(Status::OK(), result->status());
auto out = result->at(0);
// out->printIndexedBuffer("Adjusted Constrast");
ASSERT_TRUE(e.equalsTo(out));
delete result;
}
TEST_F(DeclarableOpsTests15, Test_depthwise_bp_1) {
auto in = NDArrayFactory::create<float>('c', {4, 8, 64, 64});
auto w = NDArrayFactory::create<float>('c', {2, 2, 8, 2});