| 28 | using GPUDevice = Eigen::GpuDevice; |
| 29 | |
| 30 | Status GenerateKey(Tensor seed, random::PhiloxRandom::Key* out_key, |
| 31 | random::PhiloxRandom::ResultType* out_counter) { |
| 32 | // Grab the two seeds |
| 33 | uint64 seed0; |
| 34 | uint64 seed1; |
| 35 | if (seed.dtype() == DT_INT32) { |
| 36 | const auto seed_vals = seed.flat<int32>(); |
| 37 | seed0 = internal::SubtleMustCopy(seed_vals(0)); |
| 38 | seed1 = internal::SubtleMustCopy(seed_vals(1)); |
| 39 | } else if (seed.dtype() == DT_INT64) { |
| 40 | const auto seed_vals = seed.flat<int64>(); |
| 41 | seed0 = internal::SubtleMustCopy(seed_vals(0)); |
| 42 | seed1 = internal::SubtleMustCopy(seed_vals(1)); |
| 43 | } else { |
| 44 | return errors::InvalidArgument("Invalid seed type: ", |
| 45 | DataTypeString(seed.dtype())); |
| 46 | } |
| 47 | |
| 48 | // Scramble the seeds so that the user doesn't need to worry about which |
| 49 | // part of the seed needs to be strong. |
| 50 | (*out_key)[0] = 0x3ec8f720; |
| 51 | (*out_key)[1] = 0x02461e29; |
| 52 | (*out_counter)[0] = static_cast<uint32>(seed0); |
| 53 | (*out_counter)[1] = static_cast<uint32>(seed0 >> 32); |
| 54 | (*out_counter)[2] = static_cast<uint32>(seed1); |
| 55 | (*out_counter)[3] = static_cast<uint32>(seed1 >> 32); |
| 56 | const auto mix = random::PhiloxRandom(*out_counter, *out_key)(); |
| 57 | (*out_key)[0] = mix[0]; |
| 58 | (*out_key)[1] = mix[1]; |
| 59 | (*out_counter)[0] = (*out_counter)[1] = 0; |
| 60 | (*out_counter)[2] = mix[2]; |
| 61 | (*out_counter)[3] = mix[3]; |
| 62 | return Status::OK(); |
| 63 | } |
| 64 | |
| 65 | namespace { |
| 66 |
no test coverage detected