src/operator/image/resize.cc

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
/*!
 * \file resize.cc
 * \brief resize operator cpu
 * \author Jake Lee
 */
#include <mxnet/base.h>
#include "./resize-inl.h"
#include "../operator_common.h"
#include "../elemwise_op_common.h"

namespace mxnet {
namespace op {
namespace image {

DMLC_REGISTER_PARAMETER(ResizeParam);

NNVM_REGISTER_OP(_image_resize)
    .add_alias("_npx__image_resize")
    .describe(R"code(Resize an image NDArray of shape (H x W x C) or (N x H x W x C)
to the given size. Example:

.. code-block:: python

    image = mx.nd.random.uniform(0, 255, (4, 2, 3)).astype(dtype=np.uint8)
    mx.nd.image.resize(image, (3, 3))
        [[[124 111 197]
          [158  80 155]
          [193  50 112]]

         [[110 100 113]
          [134 165 148]
          [157 231 182]]

         [[202 176 134]
          [174 191 149]
          [147 207 164]]]
        <NDArray 3x3x3 @cpu(0)>

    image = mx.nd.random.uniform(0, 255, (2, 4, 2, 3)).astype(dtype=np.uint8)
    mx.nd.image.resize(image, (2, 2))
        [[[[ 59 133  80]
           [187 114 153]]

          [[ 38 142  39]
           [207 131 124]]]


          [[[117 125 136]
           [191 166 150]]

          [[129  63 113]
           [182 109  48]]]]
        <NDArray 2x2x2x3 @cpu(0)>

)code" ADD_FILELINE)
    .set_num_inputs(1)
    .set_num_outputs(1)
    .set_attr_parser(ParamParser<ResizeParam>)
    .set_attr<mxnet::FInferShape>("FInferShape", ResizeShape)
    .set_attr<nnvm::FInferType>("FInferType", ElemwiseType<1, 1>)
    .set_attr<FCompute>("FCompute<cpu>", Resize<cpu>)
    .set_attr<nnvm::FGradient>("FGradient", ElemwiseGradUseNone{"_copy"})
    .add_argument("data", "NDArray-or-Symbol", "The input.")
    .add_arguments(ResizeParam::__FIELDS__());

}  // namespace image
}  // namespace op
}  // namespace mxnet