InvalidArgumentError (see above for traceback): Nan in summary histogram for: HistogramSummary_2 [[Node: HistogramSummary_2 = HistogramSummary[T=DT_FLOAT, _device="/job:localhost/replica:0/task:0/cpu:0"](HistogramSummary_2/tag, discriminator_1/Sigmoid)]]

when I trying to train a model,it only run for 940 batchs,and i got an error.
`Traceback (most recent call last):
File "main.py", line 147, in
tf.app.run()
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/platform/app.py", line 43, in run
sys.exit(main(sys.argv[:1] + flags_passthrough))
File "main.py", line 120, in main
dcgan.train(FLAGS)
File "/Users/xiaochenyue/Desktop/zjy/DCGAN-tensorflow/model.py", line 284, in train
feed_dict={ self.z: batch_z })
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/client/session.py", line 766, in run
run_metadata_ptr)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/client/session.py", line 964, in _run
feed_dict_string, options, run_metadata)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/client/session.py", line 1014, in _do_run
target_list, options, run_metadata)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/client/session.py", line 1034, in _do_call
raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Nan in summary histogram for: HistogramSummary_2
[[Node: HistogramSummary_2 = HistogramSummary[T=DT_FLOAT, _device="/job:localhost/replica:0/task:0/cpu:0"](HistogramSummary_2/tag, discriminator_1/Sigmoid)]]

Caused by op u'HistogramSummary_2', defined at:
File "main.py", line 147, in
tf.app.run()
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/platform/app.py", line 43, in run
sys.exit(main(sys.argv[:1] + flags_passthrough))
File "main.py", line 115, in main
max_to_keep=FLAGS.max_to_keep)
File "/Users/xiaochenyue/Desktop/zjy/DCGAN-tensorflow/model.py", line 104, in __init__
self.build_model()
File "/Users/xiaochenyue/Desktop/zjy/DCGAN-tensorflow/model.py", line 132, in build_model
self.d__sum = histogram_summary("d_", self.D_)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/util/deprecation.py", line 110, in new_func
return func(*args, **kwargs)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/ops/logging_ops.py", line 101, in histogram_summary
tag=tag, values=values, name=scope)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/ops/gen_logging_ops.py", line 139, in _histogram_summary
name=name)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/framework/op_def_library.py", line 759, in apply_op
op_def=op_def)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 2240, in create_op
original_op=self._default_original_op, op_def=op_def)
File "/Users/xiaochenyue/opt/anaconda3/envs/py33/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 1128, in __init__
self._traceback = _extract_stack()

InvalidArgumentError (see above for traceback): Nan in summary histogram for: HistogramSummary_2
[[Node: HistogramSummary_2 = HistogramSummary[T=DT_FLOAT, _device="/job:localhost/replica:0/task:0/cpu:0"](HistogramSummary_2/tag, discriminator_1/Sigmoid)]]`
when I rerun it,it will run for a while,and raise same error.

Start with main.py lines 120 and 147 and model.py lines 104, 132, and 284, then reproduce the failure near batch 940. Trace the values reaching discriminator_1/Sigmoid and HistogramSummary_2; done means identifying the source of the NaN and confirming whether the failure can be reliably reproduced and resolved.

Written by the indexing model from the issue text.