Tensorflow 中 Estimator 中的自定义 eval_metric_ops [英] Custom eval_metric_ops in Estimator in Tensorflow
问题描述
我正在尝试在我的估算器的 eval_metric_ops 中添加 r 平方,如下所示:
I am trying to add the r squared in the eval_metric_ops in my estimator like this:
def model_fn(features, labels, mode, params):
predict = prediction(features, params, mode)
loss = my_loss_fn
eval_metric_ops = {
'rsquared': tf.subtract(1.0, tf.div(tf.reduce_sum(tf.squared_difference(label, tf.reduce_sum(tf.squared_difference(labels, tf.reduce_mean(labels)))),
name = 'rsquared')
}
train_op = tf.contrib.layers.optimize_loss(
loss = loss,
global_step = global_step,
learning_rate = 0.1,
optimizer = "Adam"
)
predictions = {"predictions": predict}
return tf.estimator.EstimatorSpec(
mode = mode,
predictions = predictions,
loss = loss,
train_op = train_op,
eval_metric_ops = eval_metric_ops
)
但我有以下错误:
TypeError: eval_metric_ops 的值必须是 (metric_value, update_op)元组,给定: Tensor("rsquared:0", shape=(), dtype=float32) 键:平方
TypeError: Values of eval_metric_ops must be (metric_value, update_op) tuples, given: Tensor("rsquared:0", shape=(), dtype=float32) for key: rsquared
我也尝试不使用 name 参数,但没有任何改变.你知道如何创建这个 eval_metric_ops 吗?
I tried without the name argument too but does not change anything. Do you know how to create this eval_metric_ops ?
推荐答案
eval_metric_ops
需要一个以名称为键的度量结果字典.dict 的值是调用度量函数的结果.您案例中的度量函数可以使用 tf.metrics
实现:
eval_metric_ops
needs a dict of metric results keyed by name. The values of the dict are the results of calling a metric function. The metric function in your case can be implemented using tf.metrics
:
def metric_fn(labels, predict):
SST, update_op1 = tf.metrics.mean_squared_error(labels, tf.reduce_mean(labels))
SSE, update_op2 = tf.metrics.mean_squared_error(labels, predictions )
return tf.subtract(1.0, tf.div(SSE, SST)), tf.group(update_op1, update_op2))
这篇关于Tensorflow 中 Estimator 中的自定义 eval_metric_ops的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!