[webgpu] Add support for OnesLike (#4788)

FEATURE

tfjs-backend-webgpu/src/kernels/OnesLike.ts

@@ -0,0 +1,58 @@
+/**
+ * @license
+ * Copyright 2021 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 {KernelConfig, KernelFunc, OnesLike, OnesLikeInputs, TensorInfo} from '@tensorflow/tfjs-core';
+
+import {WebGPUBackend} from '../backend_webgpu';
+
+import {complex} from './Complex';
+import {fill} from './Fill';
+import {imag} from './Imag';
+import {real} from './Real';
+import {zerosLike} from './ZerosLike';
+
+export function onesLike(
+    args: {inputs: OnesLikeInputs, backend: WebGPUBackend}): TensorInfo {
+  const {inputs, backend} = args;
+  const {x} = inputs;
+
+  if (x.dtype === 'string') {
+    throw new Error('onesLike is not supported under string dtype');
+  } else if (x.dtype === 'complex64') {
+    const realPart = real({inputs: {input: x}, backend});
+    const r = onesLike({inputs: {x: realPart}, backend});
+    const imagPart = imag({inputs: {input: x}, backend});
+    const i = zerosLike({inputs: {x: imagPart}, backend});
+
+    const result = complex({inputs: {real: r, imag: i}, backend});
+
+    backend.disposeData(realPart.dataId);
+    backend.disposeData(r.dataId);
+    backend.disposeData(imagPart.dataId);
+    backend.disposeData(i.dataId);
+
+    return result;
+  } else {
+    return fill({attrs: {shape: x.shape, dtype: x.dtype, value: 1}, backend});
+  }
+}
+
+export const onesLikeConfig: KernelConfig = {
+  kernelName: OnesLike,
+  backendName: 'webgpu',
+  kernelFunc: onesLike as {} as KernelFunc
+};

tfjs-backend-webgpu/src/register_all_kernels.ts

@@ -62,6 +62,7 @@ import {negConfig} from './kernels/Neg';
 import {nonMaxSuppressionV3Config} from './kernels/NonMaxSuppressionV3';
 import {nonMaxSuppressionV5Config} from './kernels/NonMaxSuppressionV5';
 import {notEqualConfig} from './kernels/NotEqual';
+import {onesLikeConfig} from './kernels/OnesLike';
 import {packConfig} from './kernels/Pack';
 import {padV2Config} from './kernels/PadV2';
 import {preluConfig} from './kernels/Prelu';
@@ -134,6 +135,7 @@ const kernelConfigs: KernelConfig[] = [
   nonMaxSuppressionV3Config,
   nonMaxSuppressionV5Config,
   notEqualConfig,
+  onesLikeConfig,
   packConfig,
   padV2Config,
   preluConfig,

tfjs-backend-webgpu/src/setup_test.ts

@@ -541,6 +541,14 @@ const TEST_FILTERS: TestFilter[] = [
       '6D',       // rank 6 is not yet supported.
       'gradient'  // gradient function not found.
     ]
+  },
+  {
+    include: 'onesLike',
+    excludes: [
+      '5D',       // rank 5 is not yet supported.
+      '6D',       // rank 6 is not yet supported.
+      'gradient'  // gradient function not found.
+    ]
   }
 ];