1/* Copyright 2022 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#ifndef TENSORFLOW_CORE_KERNELS_STATELESS_RANDOM_OPS_V2_UTIL_H_
17#define TENSORFLOW_CORE_KERNELS_STATELESS_RANDOM_OPS_V2_UTIL_H_
18
19// Utilities for V2 stateless random ops' (non-XLA) kernels.
20
21#include <string>
22
23#include "tensorflow/core/framework/op_kernel.h"
24#include "tensorflow/core/kernels/stateless_random_ops_v2.h"
25
26namespace tensorflow {
27
28template <typename T>
29Status GetScalar(const Tensor& tensor, int input_idx, T* result) {
30 auto dtype = DataTypeToEnum<T>::v();
31 if (tensor.dims() != 0) {
32 return errors::InvalidArgument("input ", std::to_string(input_idx),
33 " (0-based) must have shape [], not ",
34 tensor.shape().DebugString());
35 }
36 if (tensor.dtype() != dtype) {
37 return errors::InvalidArgument("dtype of input ", std::to_string(input_idx),
38 " (0-based) must be ", DataTypeString(dtype),
39 ", not ", DataTypeString(tensor.dtype()));
40 }
41 *result = tensor.flat<T>()(0);
42 return OkStatus();
43}
44
45inline StatusOr<std::tuple<Tensor, Tensor, Algorithm> >
46GetKeyCounterAlgFromInputs(OpKernelContext* ctx, int key_input_idx,
47 int counter_input_idx, int alg_input_idx) {
48 const Tensor& key_t = ctx->input(key_input_idx);
49 const Tensor& counter_t = ctx->input(counter_input_idx);
50 const Tensor& alg_t = ctx->input(alg_input_idx);
51
52 int alg_id;
53 TF_RETURN_IF_ERROR(GetScalar(alg_t, alg_input_idx, &alg_id));
54 Algorithm alg = Algorithm(alg_id);
55 if (alg == RNG_ALG_AUTO_SELECT) {
56 alg = RNG_ALG_PHILOX;
57 }
58
59 TF_RETURN_IF_ERROR(
60 CheckKeyCounterShape(alg, key_t.shape(), counter_t.shape()));
61 return std::make_tuple(key_t, counter_t, alg);
62}
63
64} // end namespace tensorflow
65
66#endif // TENSORFLOW_CORE_KERNELS_STATELESS_RANDOM_OPS_V2_UTIL_H_
67