"use strict";
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/**
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* @license
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* Copyright 2018 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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var engine_1 = require("../engine");
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var tensor_util_env_1 = require("../tensor_util_env");
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var operation_1 = require("./operation");
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/**
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* Finds the values and indices of the `k` largest entries along the last
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* dimension.
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*
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* If the input is a vector (rank=1), finds the k largest entries in the vector
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* and outputs their values and indices as vectors. Thus values[j] is the j-th
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* largest entry in input, and its index is indices[j].
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* For higher rank inputs, computes the top k entries along the last dimension.
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*
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* If two elements are equal, the lower-index element appears first.
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*
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* ```js
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* const a = tf.tensor2d([[1, 5], [4, 3]]);
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* const {values, indices} = tf.topk(a);
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* values.print();
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* indices.print();
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* ```
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* @param x 1-D or higher `tf.Tensor` with last dimension being at least `k`.
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* @param k Number of top elements to look for along the last dimension.
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* @param sorted If true, the resulting `k` elements will be sorted by the
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* values in descending order.
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*/
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/** @doc {heading: 'Operations', subheading: 'Evaluation'} */
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function topk_(x, k, sorted) {
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if (k === void 0) { k = 1; }
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if (sorted === void 0) { sorted = true; }
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var $x = tensor_util_env_1.convertToTensor(x, 'x', 'topk');
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if ($x.rank === 0) {
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throw new Error('topk() expects the input to be of rank 1 or higher');
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}
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var lastDim = $x.shape[$x.shape.length - 1];
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if (k > lastDim) {
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throw new Error("'k' passed to topk() must be <= the last dimension (" + lastDim + ") " +
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("but got " + k));
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}
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var _a = engine_1.ENGINE.runKernelFunc(function (b) { return b.topk($x, k, sorted); }, { $x: $x }), values = _a[0], indices = _a[1];
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return { values: values, indices: indices };
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}
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exports.topk = operation_1.op({ topk_: topk_ });
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//# sourceMappingURL=topk.js.map
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