Add `tf.contrib.stateless.stateless_multinomial()`.

This is a starting point for Dataset-compatible weighted sampling across a list of datasets.

PiperOrigin-RevId: 192540412

1 files changed, 34 insertions, 0 deletions

diff --git a/tensorflow/core/kernels/stateless_random_ops.h b/tensorflow/core/kernels/stateless_random_ops.h
new file mode 100644
index 0000000000..bcd29c4873
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+++ b/tensorflow/core/kernels/stateless_random_ops.h
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+/* Copyright 2018 The TensorFlow Authors. 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.
+==============================================================================*/
+
+#ifndef TENSORFLOW_CORE_KERNELS_STATELESS_RANDOM_OPS_H_
+#define TENSORFLOW_CORE_KERNELS_STATELESS_RANDOM_OPS_H_
+
+#include "tensorflow/core/framework/tensor.h"
+#include "tensorflow/core/lib/random/random_distributions.h"
+
+namespace tensorflow {
+
+// Generates a key and counter that can be used to seed a PhiloxRandom,
+// generator, based on the seed value in `seed_t`.
+//
+// REQUIRES: `seed_t` must be a length-2 vector of type DT_INT{32,64}.
+// `out_key` and `out_counter` must be non-null.
+Status GenerateKey(Tensor seed_t, random::PhiloxRandom::Key* out_key,
+                   random::PhiloxRandom::ResultType* out_counter);
+
+}  // namespace tensorflow
+
+#endif  // TENSORFLOW_CORE_KERNELS_STATELESS_RANDOM_OPS_H_