如何使用tensorflow tf.metrics.mean_iou？

我正在嘗試使用tensorflow的內置mean_iou函數來計算語義分割的IoU分數。如何使用tensorflow tf.metrics.mean_iou？

我的代碼是：

#y_mask.shape == [batch_size, h * w, n_classes] 
#y_mask.shape == [batch_size, h * w, n_classes] 
iou = tf.metrics.mean_iou(tf.argmax(y_mask,2), tf.argmax(mask_,2), n_classes)

但是我收到以下錯誤跟蹤：

tensorflow.python.framework.errors_impl.FailedPreconditionError: 

Attempting to use uninitialized value mean_iou/total_confusion 
_matrix 
     [[Node: mean_iou/AssignAdd = AssignAdd[T=DT_DOUBLE, _class=["loc:@mean_iou/total_confusion_matrix"], use_locking=false 
, _device="/job:localhost/replica:0/task:0/cpu:0"](mean_iou/total_confusion_matrix, mean_iou/confusion_matrix/SparseTensorDense 
Add)]] 

Caused by op u'mean_iou/AssignAdd', defined at: 
    File "sample_tf_ynet.py", line 207, in <module> 
    trainSeg() 
    File "sample_tf_ynet.py", line 166, in trainSeg 
    iou, cm_op = tf.metrics.mean_iou(tf.argmax(y_mask,2), tf.argmax(mask_,2), n_classes) 
    File "/home/meetshah1995/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/metrics_impl.py", line 782, in mean_iou 
    update_op = state_ops.assign_add(total_cm, current_cm) 
    File "/home/meetshah1995/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/gen_state_ops.py", line 75, in assign_ad 
d 
    use_locking=use_locking, name=name) 
    File "/home/meetshah1995/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/op_def_library.py", line 763, in a 
pply_op 
    op_def=op_def) 
    File "/home/meetshah1995/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 2395, in create_op 
    original_op=self._default_original_op, op_def=op_def) 
    File "/home/meetshah1995/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 1264, in __init__ 
    self._traceback = _extract_stack() 

FailedPreconditionError (see above for traceback): Attempting to use uninitialized value mean_iou/total_confusion_matrix 
     [[Node: mean_iou/AssignAdd = AssignAdd[T=DT_DOUBLE, _class=["loc:@mean_iou/total_confusion_matrix"], use_locking=false 
, _device="/job:localhost/replica:0/task:0/cpu:0"](mean_iou/total_confusion_matrix, mean_iou/confusion_matrix/SparseTensorDense 
Add)]]

請指導我的這個語義分割的正確用法。

來源

2017-03-07 stochastic_zeitgeist

你叫'tf.initialize_all_variables（）'後解決它？ – umutto

是的，我剛剛調用會話後，我正在做'sess.run（tf.global_variables_initializer（））' –

我通過調用

with tf.Session() as sess: 

    sess.run(tf.global_variables_initializer()) 
    sess.run(tf.local_variables_initializer())

來源

2017-03-07 08:54:44

如何使用tensorflow tf.metrics.mean_iou？

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