1# Copyright 2017 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"""Libsvm decoder.""" 16from __future__ import absolute_import 17from __future__ import division 18from __future__ import print_function 19 20from tensorflow.contrib.libsvm.ops import gen_libsvm_ops 21from tensorflow.contrib.util import loader 22from tensorflow.python.framework import ops 23from tensorflow.python.framework import sparse_tensor 24from tensorflow.python.platform import resource_loader 25 26 27_libsvm_ops_so = loader.load_op_library( 28 resource_loader.get_path_to_datafile("_libsvm_ops.so")) 29 30 31def decode_libsvm(content, num_features, dtype=None, label_dtype=None): 32 """Convert Libsvm records to a tensor of label and a tensor of feature. 33 34 Args: 35 content: A `Tensor` of type `string`. Each string is a record/row in 36 the Libsvm format. 37 num_features: The number of features. 38 dtype: The type of the output feature tensor. Default to tf.float32. 39 label_dtype: The type of the output label tensor. Default to tf.int64. 40 41 Returns: 42 features: A `SparseTensor` of the shape `[input_shape, num_features]`. 43 labels: A `Tensor` of the same shape as content. 44 """ 45 labels, indices, values, shape = gen_libsvm_ops.decode_libsvm( 46 content, num_features, dtype=dtype, label_dtype=label_dtype) 47 return sparse_tensor.SparseTensor(indices, values, shape), labels 48 49 50ops.NotDifferentiable("DecodeLibSVM") 51