如何在 TensorFlow 中初始化 tf.metrics 成员？答案

【问题标题】：How to initialize tf.metrics members in TensorFlow?如何在 TensorFlow 中初始化 tf.metrics 成员？
【发布时间】：2017-12-03 04:47:35
【问题描述】：

以下是我的项目代码的一部分。

with tf.name_scope("test_accuracy"):
    test_mean_abs_err, test_mean_abs_err_op = tf.metrics.mean_absolute_error(labels=label_pl, predictions=test_eval_predict)
    test_accuracy, test_accuracy_op         = tf.metrics.accuracy(labels=label_pl, predictions=test_eval_predict)
    test_precision, test_precision_op       = tf.metrics.precision(labels=label_pl, predictions=test_eval_predict)
    test_recall, test_recall_op             = tf.metrics.recall(labels=label_pl, predictions=test_eval_predict)
    test_f1_measure = 2 * test_precision * test_recall / (test_precision + test_recall)
tf.summary.scalar('test_mean_abs_err', test_mean_abs_err)
tf.summary.scalar('test_accuracy', test_accuracy)
tf.summary.scalar('test_precision', test_precision)
tf.summary.scalar('test_recall', test_recall)
tf.summary.scalar('test_f1_measure', test_f1_measure)
# validation metric init op
validation_metrics_init_op = tf.variables_initializer(\
        var_list=[test_mean_abs_err_op, test_accuracy_op, test_precision_op, test_recall_op], \
        name='validation_metrics_init')

但是，当我运行它时，会出现如下错误：

Traceback (most recent call last):
  File "./run_dnn.py", line 285, in <module>
    train(wnd_conf)
  File "./run_dnn.py", line 89, in train
    name='validation_metrics_init')
  File "/export/local/anaconda2/lib/python2.7/site-
packages/tensorflow/python/ops/variables.py", line 1176, in 
variables_initializer
return control_flow_ops.group(*[v.initializer for v in var_list], name=name)
AttributeError: 'Tensor' object has no attribute 'initializer'

我意识到我无法创建这样的验证初始化程序。当我保存新的检查点模型并应用新一轮验证时，我想重新计算相应的指标。因此，我必须将指标重新初始化为零。

但是如何将所有这些指标重置为零？非常感谢您的帮助！

【问题讨论】：

标签： tensorflow metrics

【解决方案1】：

参考博文（Avoiding headaches with tf.metrics）后，我通过以下方式解决了问题。

# validation metrics
validation_metrics_var_scope = "validation_metrics"
test_mean_abs_err, test_mean_abs_err_op = tf.metrics.mean_absolute_error(labels=label_pl, predictions=test_eval_predict, name=validation_metrics_var_scope)
test_accuracy, test_accuracy_op         = tf.metrics.accuracy(labels=label_pl, predictions=test_eval_predict, name=validation_metrics_var_scope)
test_precision, test_precision_op       = tf.metrics.precision(labels=label_pl, predictions=test_eval_predict, name=validation_metrics_var_scope)
test_recall, test_recall_op             = tf.metrics.recall(labels=label_pl, predictions=test_eval_predict, name=validation_metrics_var_scope)
test_f1_measure = 2 * test_precision * test_recall / (test_precision + test_recall)
tf.summary.scalar('test_mean_abs_err', test_mean_abs_err)
tf.summary.scalar('test_accuracy', test_accuracy)
tf.summary.scalar('test_precision', test_precision)
tf.summary.scalar('test_recall', test_recall)
tf.summary.scalar('test_f1_measure', test_f1_measure)
# validation metric init op
validation_metrics_vars = tf.get_collection(tf.GraphKeys.LOCAL_VARIABLES, scope=validation_metrics_var_scope)
validation_metrics_init_op = tf.variables_initializer(var_list=validation_metrics_vars, name='validation_metrics_init')

【讨论】：