| /* Copyright 2015 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. |
| ==============================================================================*/ |
| |
| #include "tensorflow/core/kernels/string_to_hash_bucket_op.h" |
| |
| #include "tensorflow/core/lib/hash/hash.h" |
| #include "tensorflow/core/platform/fingerprint.h" |
| #include "tensorflow/core/platform/strong_hash.h" |
| |
| namespace tensorflow { |
| |
| // Deprecated class. It also uses `string_tensor` as Op argument instead of |
| // `input`. |
| class LegacyStringToHashBucketOp : public OpKernel { |
| public: |
| explicit LegacyStringToHashBucketOp(OpKernelConstruction* ctx) |
| : OpKernel(ctx) { |
| OP_REQUIRES_OK(ctx, ctx->GetAttr("num_buckets", &num_buckets_)); |
| } |
| |
| void Compute(OpKernelContext* context) override { |
| const Tensor* input_tensor; |
| OP_REQUIRES_OK(context, context->input("string_tensor", &input_tensor)); |
| const auto& input_flat = input_tensor->flat<tstring>(); |
| |
| Tensor* output_tensor = nullptr; |
| OP_REQUIRES_OK(context, |
| context->allocate_output("output", input_tensor->shape(), |
| &output_tensor)); |
| auto output_flat = output_tensor->flat<int64>(); |
| |
| typedef decltype(input_flat.size()) Index; |
| for (Index i = 0; i < input_flat.size(); ++i) { |
| const uint64 input_hash = Hash64(input_flat(i)); |
| const uint64 bucket_id = input_hash % num_buckets_; |
| // The number of buckets is always in the positive range of int64 so is |
| // the resulting bucket_id. Casting the bucket_id from uint64 to int64 is |
| // safe. |
| output_flat(i) = static_cast<int64>(bucket_id); |
| } |
| } |
| |
| private: |
| int64 num_buckets_; |
| |
| TF_DISALLOW_COPY_AND_ASSIGN(LegacyStringToHashBucketOp); |
| }; |
| |
| // StringToHashBucket is deprecated in favor of StringToHashBucketFast/Strong. |
| REGISTER_KERNEL_BUILDER(Name("StringToHashBucket").Device(DEVICE_CPU), |
| LegacyStringToHashBucketOp); |
| |
| REGISTER_KERNEL_BUILDER(Name("StringToHashBucketFast").Device(DEVICE_CPU), |
| StringToHashBucketOp<Fingerprint64>); |
| |
| REGISTER_KERNEL_BUILDER(Name("StringToHashBucketStrong").Device(DEVICE_CPU), |
| StringToKeyedHashBucketOp<StrongKeyedHash>); |
| |
| } // namespace tensorflow |