【发布时间】：2018-03-06 15:15:39
【问题描述】：
sess.run(tf.metrics.auc(labels, preds))
我尝试使用 tensorflow 来计算 auc。我的版本是1.0。 但是有一些错误。 任何人都可以举例说明如何使用它？ 我看到了一些以前的问题，但似乎已经过时了。 任何人都可以在新版本中提供正确的代码吗？ FailedPreconditionError：尝试使用未初始化的值 auc/false_positives [[节点：auc/false_positives/read = IdentityT=DT_FLOAT, _class=["loc:@auc/false_positives"], _device="/job:localhost/replica:0/task:0/cpu:0"]]]
Caused by op u'auc/false_positives/read', defined at:
File "/home/xuemeng.cyn/anaconda2/bin/ipython", line 6, in <module>
sys.exit(IPython.start_ipython())
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/IPython/__init__.py", line 119, in start_ipython
return launch_new_instance(argv=argv, **kwargs)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/traitlets/config/application.py", line 658, in launch_instance
app.start()
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/IPython/terminal/ipapp.py", line 348, in start
self.shell.mainloop()
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/IPython/terminal/interactiveshell.py", line 486, in mainloop
self.interact()
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/IPython/terminal/interactiveshell.py", line 477, in interact
self.run_cell(code, store_history=True)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2717, in run_cell
interactivity=interactivity, compiler=compiler, result=result)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2827, in run_ast_nodes
if self.run_code(code, result):
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2881, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-29-2bca3b61757e>", line 1, in <module>
sess.run(tf.metrics.auc(labels, preds))
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/metrics_impl.py", line 626, in auc
labels, predictions, thresholds, weights)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/metrics_impl.py", line 544, in _confusion_matrix_at_thresholds
false_p = _create_local('false_positives', shape=[num_thresholds])
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/metrics_impl.py", line 196, in _create_local
validate_shape=validate_shape)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/variable_scope.py", line 1679, in variable
caching_device=caching_device, name=name, dtype=dtype)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/variables.py", line 199, in __init__
expected_shape=expected_shape)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/variables.py", line 330, in _init_from_args
self._snapshot = array_ops.identity(self._variable, name="read")
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/gen_array_ops.py", line 1400, in identity
result = _op_def_lib.apply_op("Identity", input=input, name=name)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/op_def_library.py", line 767, in apply_op
op_def=op_def)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 2630, in create_op
original_op=self._default_original_op, op_def=op_def)
File "/home/xuemeng.cyn/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 1204, in __init__
self._traceback = self._graph._extract_stack() # pylint: disable=protected-access
FailedPreconditionError (see above for traceback): Attempting to use uninitialized value auc/false_positives
[[Node: auc/false_positives/read = Identity[T=DT_FLOAT, _class=["loc:@auc/false_positives"], _device="/job:localhost/replica:0/task:0/cpu:0"](auc/false_positives)]]
【问题讨论】：
标签： tensorflow