127 lines
4.8 KiB
C++
127 lines
4.8 KiB
C++
/*******************************************************************************
|
|
* 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 raver119@gmail.com
|
|
// @author Oleh Semeniv (oleg.semeniv@gmail.com)
|
|
//
|
|
|
|
#include <system/op_boilerplate.h>
|
|
#if NOT_EXCLUDED(OP_Pow)
|
|
|
|
#include <ops/declarable/generic/helpers/BroadcastHelper.h>
|
|
#include <ops/declarable/CustomOperations.h>
|
|
|
|
namespace sd {
|
|
namespace ops {
|
|
BROADCASTABLE_OP_IMPL(Pow, 0, 0) {
|
|
auto x = INPUT_VARIABLE(0);
|
|
auto y = INPUT_VARIABLE(1);
|
|
auto z = OUTPUT_VARIABLE(0);
|
|
|
|
BROADCAST_CHECK_EMPTY(x,y,z);
|
|
|
|
//REQUIRE_TRUE(!y->isB(), 0, "Pairwise OP: you can't divide by bool array!");
|
|
|
|
auto tZ = BroadcastHelper::broadcastApply({scalar::Pow, pairwise::Pow, broadcast::Pow}, x, y, z);
|
|
if (tZ == nullptr)
|
|
return ND4J_STATUS_KERNEL_FAILURE;
|
|
else if (tZ != z) {
|
|
OVERWRITE_RESULT(tZ);
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
DECLARE_TYPES(Pow) {
|
|
getOpDescriptor()
|
|
->setAllowedInputTypes(0, {ALL_FLOATS, ALL_INTS})
|
|
->setAllowedInputTypes(1, {ALL_FLOATS, ALL_INTS})
|
|
->setAllowedOutputTypes(0, {ALL_FLOATS, ALL_INTS});
|
|
}
|
|
|
|
CUSTOM_OP_IMPL(Pow_bp, 3, 2, false, 0, 0) {
|
|
|
|
auto x = INPUT_VARIABLE(0);
|
|
auto y = INPUT_VARIABLE(1);
|
|
auto dLdz = INPUT_VARIABLE(2);
|
|
|
|
auto dLdx = OUTPUT_VARIABLE(0);
|
|
auto dLdy = OUTPUT_VARIABLE(1);
|
|
|
|
Nd4jLong* dLdzShapeInfo = nullptr;
|
|
const bool areShapesBroadcastable = ShapeUtils::evalBroadcastShapeInfo(x->getShapeInfo(), y->getShapeInfo(), true, dLdzShapeInfo, block.getWorkspace());
|
|
REQUIRE_TRUE(areShapesBroadcastable, 0, "POW_BP OP: the shapes of x %s"
|
|
" and y %s are not suitable for broadcast !",
|
|
ShapeUtils::shapeAsString(x).c_str(), ShapeUtils::shapeAsString(y).c_str());
|
|
REQUIRE_TRUE(shape::equalsSoft(dLdz->shapeInfo(), dLdzShapeInfo), 0,
|
|
"POW_BP OP: wrong shape of next epsilon array (dLdOut),"
|
|
" expected is %s, but got %s instead !",
|
|
ShapeUtils::shapeAsString(dLdzShapeInfo).c_str(), ShapeUtils::shapeAsString(dLdz).c_str());
|
|
|
|
// dL/dy = x^y * log(x) * dL/dz
|
|
auto temp = x->applyTrueBroadcast(BroadcastOpsTuple::Pow(), *y); // a = x^y
|
|
x->applyTransform(transform::Log, *dLdx); // b = log(x)
|
|
dLdx->applyScalar(sd::scalar::ReplaceNans, 0, *dLdx);
|
|
temp *= *dLdx; // c = b*a
|
|
temp *= *dLdz; // dL/dy = c * dL/dz
|
|
if (dLdy->isSameShape(*dLdz)) {
|
|
dLdy->assign(temp);
|
|
}
|
|
else {
|
|
std::vector<int> axesForY = ShapeUtils::evalBroadcastBackwardAxis(y->getShapeInfo(), dLdz->getShapeInfo());
|
|
dLdy->assign(temp.reduceAlongDimension(reduce::Sum, axesForY)); // dL/dy = sum(c * dL/dz)
|
|
}
|
|
|
|
// dL/dx = y*x^(y-1) * dL/dz
|
|
x->applyTrueBroadcast(BroadcastOpsTuple::PowDerivative(), *y, temp); // a = y*x^(y-1)
|
|
temp *= *dLdz; // dLdx = a*dL/dz
|
|
|
|
if (dLdx->isSameShape(*dLdz)) {
|
|
dLdx->assign(temp); // dLdx = a*dL/dz
|
|
}
|
|
else {
|
|
std::vector<int> axesForX = ShapeUtils::evalBroadcastBackwardAxis(x->getShapeInfo(), dLdz->getShapeInfo());
|
|
dLdx->assign(temp.reduceAlongDimension(reduce::Sum, axesForX)); // dLdx = a*dL/dz
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
DECLARE_SHAPE_FN(Pow_bp) {
|
|
|
|
auto xShapeInfo = inputShape->at(0);
|
|
auto yShapeInfo = inputShape->at(1);
|
|
|
|
Nd4jLong* dLdxShapeInfo = nullptr;
|
|
Nd4jLong* dLdyShapeInfo = nullptr;
|
|
|
|
COPY_SHAPE(xShapeInfo, dLdxShapeInfo);
|
|
COPY_SHAPE(yShapeInfo, dLdyShapeInfo);
|
|
|
|
return SHAPELIST(CONSTANT(dLdxShapeInfo), CONSTANT(dLdyShapeInfo));
|
|
}
|
|
|
|
DECLARE_TYPES(Pow_bp) {
|
|
getOpDescriptor()
|
|
->setAllowedInputTypes({ ALL_FLOATS, ALL_INTS })
|
|
->setAllowedOutputTypes({ ALL_FLOATS });
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
#endif |