代码tensorflow/examples/tutorials/word2vec/word2vec_basic.py有一个评论# Ops and variables pinned to the CPU because of missing GPU implementation.我还发现tf.nn.nce_lossGPU无法实现该操作.那么为什么tf.nn.nce_loss无法在GPU上运行？
我曾经log_device_placement看过MUST BE CPUOps.结果如下:
nce_loss/LogUniformCandidateSampler: (LogUniformCandidateSampler): /job:localhost/replica:0/task:0/cpu:0
I tensorflow/core/common_runtime/simple_placer.cc:841] nce_loss/LogUniformCandidateSampler: (LogUniformCandidateSampler)/job:localhost/replica:0/task:0/cpu:0
nce_loss/ComputeAccidentalHits: (ComputeAccidentalHits): /job:localhost/replica:0/task:0cpu:0
I tensorflow/core/common_runtime/simple_placer.cc:841] nce_loss/ComputeAccidentalHits: (ComputeAccidentalHits)/job:localhost/replica:0/task:0/cpu:0
nce_loss/SparseToDense: (SparseToDense): /job:localhost/replica:0/task:0/cpu:0
I tensorflow/core/common_runtime/simple_placer.cc:841] nce_loss/SparseToDense: (SparseToDense)/job:localhost/replica:0/task:0/cpu:0
nce_loss/concat: (ConcatV2): /job:localhost/replica:0/task:0/cpu:0
I tensorflow/core/common_runtime/simple_placer.cc:841] nce_loss/concat: (ConcatV2)/job:localhost/replica:0/task:0/cpu:0
nce_loss/LogUniformCandidateSampler: (LogUniformCandidateSampler): /job:localhost/replica:0/task:0/cpu:0
I tensorflow/core/common_runtime/simple_placer.cc:841] nce_loss/LogUniformCandidateSampler: (LogUniformCandidateSampler)/job:localhost/replica:0/task:0/cpu:0
nce_loss/ComputeAccidentalHits: (ComputeAccidentalHits): /job:localhost/replica:0/task:0cpu:0
I tensorflow/core/common_runtime/simple_placer.cc:841] nce_loss/ComputeAccidentalHits: (ComputeAccidentalHits)/job:localhost/replica:0/task:0/cpu:0
nce_loss/SparseToDense: (SparseToDense): /job:localhost/replica:0/task:0/cpu:0
I tensorflow/core/common_runtime/simple_placer.cc:841] nce_loss/SparseToDense: (SparseToDense)/job:localhost/replica:0/task:0/cpu:0
nce_loss/concat: (ConcatV2): /job:localhost/replica:0/task:0/cpu:0
I tensorflow/core/common_runtime/simple_placer.cc:841] …