1 | /* Copyright 2015 The TensorFlow Authors. All Rights Reserved. |
2 | |
3 | Licensed under the Apache License, Version 2.0 (the "License"); |
4 | you may not use this file except in compliance with the License. |
5 | You may obtain a copy of the License at |
6 | |
7 | http://www.apache.org/licenses/LICENSE-2.0 |
8 | |
9 | Unless required by applicable law or agreed to in writing, software |
10 | distributed under the License is distributed on an "AS IS" BASIS, |
11 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | See the License for the specific language governing permissions and |
13 | limitations under the License. |
14 | ==============================================================================*/ |
15 | |
16 | #include "tensorflow/core/util/guarded_philox_random.h" |
17 | |
18 | #include "tensorflow/core/lib/random/random.h" |
19 | #include "tensorflow/core/util/determinism.h" |
20 | |
21 | namespace tensorflow { |
22 | |
23 | Status GuardedPhiloxRandom::Init(OpKernelConstruction* context) { |
24 | // Grab seed Attrs. |
25 | int64_t seed, seed2; |
26 | auto status = context->GetAttr("seed" , &seed); |
27 | if (!status.ok()) return status; |
28 | status = context->GetAttr("seed2" , &seed2); |
29 | if (!status.ok()) return status; |
30 | if (seed == 0 && seed2 == 0 && OpDeterminismRequired()) { |
31 | return errors::InvalidArgument( |
32 | "When determinism is enabled, random ops " |
33 | "must have a seed specified." ); |
34 | } |
35 | |
36 | // Initialize with the given seeds |
37 | Init(seed, seed2); |
38 | return OkStatus(); |
39 | } |
40 | |
41 | void GuardedPhiloxRandom::Init(int64_t seed, int64_t seed2) { |
42 | CHECK(!initialized_); |
43 | if (seed == 0 && seed2 == 0) { |
44 | // If both seeds are unspecified, use completely random seeds. |
45 | seed = random::New64(); |
46 | seed2 = random::New64(); |
47 | } |
48 | mutex_lock lock(mu_); |
49 | generator_ = random::PhiloxRandom(seed, seed2); |
50 | initialized_ = true; |
51 | } |
52 | |
53 | void GuardedPhiloxRandom::Init(random::PhiloxRandom::ResultType counter, |
54 | random::PhiloxRandom::Key key) { |
55 | CHECK(!initialized_); |
56 | mutex_lock lock(mu_); |
57 | generator_ = random::PhiloxRandom(counter, key); |
58 | initialized_ = true; |
59 | } |
60 | |
61 | random::PhiloxRandom GuardedPhiloxRandom::ReserveSamples128(int64_t samples) { |
62 | CHECK(initialized_); |
63 | mutex_lock lock(mu_); |
64 | auto local = generator_; |
65 | generator_.Skip(samples); |
66 | return local; |
67 | } |
68 | |
69 | } // namespace tensorflow |
70 | |