/**
 * @license
 * Copyright 2020 Google LLC. 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.
 * =============================================================================
 */
import { Tile } from '../kernel_names';
import { add } from '../ops/add';
import { slice } from '../ops/slice';
import { zerosLike } from '../ops/zeros_like';
export const tileGradConfig = {
    kernelName: Tile,
    inputsToSave: ['x'],
    gradFunc: (dy, saved, attrs) => {
        const [x] = saved;
        const { reps } = attrs;
        const derX = () => {
            let xGrad = zerosLike(x);
            // TODO(cais): Maybe reduce memory footprint by avoiding repeated
            // slicing.
            if (x.rank === 1) {
                for (let i = 0; i < reps[0]; ++i) {
                    xGrad = add(xGrad, slice(dy, [i * x.shape[0]], [x.shape[0]]));
                }
            }
            else if (x.rank === 2) {
                for (let i = 0; i < reps[0]; ++i) {
                    for (let j = 0; j < reps[1]; ++j) {
                        xGrad = add(xGrad, slice(dy, [i * x.shape[0], j * x.shape[1]], [
                            x.shape[0], x.shape[1]
                        ]));
                    }
                }
            }
            else if (x.rank === 3) {
                for (let i = 0; i < reps[0]; ++i) {
                    for (let j = 0; j < reps[1]; ++j) {
                        for (let k = 0; k < reps[2]; ++k) {
                            xGrad =
                                add(xGrad, slice(dy, [i * x.shape[0], j * x.shape[1], k * x.shape[2]], [x.shape[0], x.shape[1], x.shape[2]]));
                        }
                    }
                }
            }
            else if (x.rank === 4) {
                for (let i = 0; i < reps[0]; ++i) {
                    for (let j = 0; j < reps[1]; ++j) {
                        for (let k = 0; k < reps[2]; ++k) {
                            for (let l = 0; l < reps[3]; ++l) {
                                xGrad =
                                    add(xGrad, slice(dy, [
                                        i * x.shape[0], j * x.shape[1], k * x.shape[2],
                                        l * x.shape[3]
                                    ], [x.shape[0], x.shape[1], x.shape[2], x.shape[3]]));
                            }
                        }
                    }
                }
            }
            else {
                throw new Error(`Gradient for tile operation is not implemented for rank-` +
                    `${x.rank} tensors yet.`);
            }
            return xGrad;
        };
        return { x: derX };
    },
};
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All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport {Tile, TileAttrs} from '../kernel_names';\nimport {GradConfig, NamedAttrMap} from '../kernel_registry';\nimport {add} from '../ops/add';\nimport {slice} from '../ops/slice';\nimport {zerosLike} from '../ops/zeros_like';\nimport {Tensor} from '../tensor';\n\nexport const tileGradConfig: GradConfig = {\n  kernelName: Tile,\n  inputsToSave: ['x'],\n  gradFunc: (dy: Tensor, saved: Tensor[], attrs: NamedAttrMap) => {\n    const [x] = saved;\n    const {reps} = attrs as unknown as TileAttrs;\n\n    const derX = () => {\n      let xGrad = zerosLike(x);\n      // TODO(cais): Maybe reduce memory footprint by avoiding repeated\n      // slicing.\n      if (x.rank === 1) {\n        for (let i = 0; i < reps[0]; ++i) {\n          xGrad = add(xGrad, slice(dy, [i * x.shape[0]], [x.shape[0]]));\n        }\n      } else if (x.rank === 2) {\n        for (let i = 0; i < reps[0]; ++i) {\n          for (let j = 0; j < reps[1]; ++j) {\n            xGrad = add(xGrad, slice(dy, [i * x.shape[0], j * x.shape[1]], [\n                          x.shape[0], x.shape[1]\n                        ]));\n          }\n        }\n      } else if (x.rank === 3) {\n        for (let i = 0; i < reps[0]; ++i) {\n          for (let j = 0; j < reps[1]; ++j) {\n            for (let k = 0; k < reps[2]; ++k) {\n              xGrad =\n                  add(xGrad,\n                      slice(\n                          dy, [i * x.shape[0], j * x.shape[1], k * x.shape[2]],\n                          [x.shape[0], x.shape[1], x.shape[2]]));\n            }\n          }\n        }\n      } else if (x.rank === 4) {\n        for (let i = 0; i < reps[0]; ++i) {\n          for (let j = 0; j < reps[1]; ++j) {\n            for (let k = 0; k < reps[2]; ++k) {\n              for (let l = 0; l < reps[3]; ++l) {\n                xGrad =\n                    add(xGrad,\n                        slice(\n                            dy,\n                            [\n                              i * x.shape[0], j * x.shape[1], k * x.shape[2],\n                              l * x.shape[3]\n                            ],\n                            [x.shape[0], x.shape[1], x.shape[2], x.shape[3]]));\n              }\n            }\n          }\n        }\n      } else {\n        throw new Error(\n            `Gradient for tile operation is not implemented for rank-` +\n            `${x.rank} tensors yet.`);\n      }\n      return xGrad;\n    };\n    return {x: derX};\n  },\n};\n"]}