tf_agents.metrics.py_metrics.NumberOfEpisodes

Counts the number of episodes in the environment.

Inherits From: PyStepMetric, PyMetric

tf_agents.metrics.py_metrics.NumberOfEpisodes(
    name: Text = 'NumberOfEpisodes'
)

prefix Prefix for the metric. summary_op TF summary op for this metric. summary_placeholder TF placeholder to be used for the result of this metric.

Methods

aggregate

View source

@staticmethod
aggregate(
    metrics: Sequence[tf_agents.metrics.py_metric.PyMetricType]
) -> tf_agents.typing.types.Float

Aggregates a list of metrics.

The default behaviour is to return the average of the metrics.

Args

metrics a list of metrics, of the same class.

Returns
The result of aggregating this metric.

call

View source

call(
    trajectory: tf_agents.trajectories.Trajectory
)

Processes a trajectory to update the metric.

Args

trajectory A trajectory.Trajectory.

log

View source

log()

reset

View source

reset()

Resets internal stat gathering variables used to compute the metric.

result

View source

result() -> np.int64

Evaluates the current value of the metric.

tf_summaries

View source

tf_summaries(
    train_step: tf_agents.typing.types.Int = None,
    step_metrics: Sequence[tf_agents.metrics.py_metric.MetricType] = ()
) -> tf.Operation

Build TF summary op and placeholder for this metric.

To execute the op, call py_metric.run_summaries.

Args

train_step Step counter for training iterations. If None, no metric is generated against the global step. step_metrics Step values to plot as X axis in addition to global_step.

Returns
The summary op.

Raises

RuntimeError If this method has already been called (it can only be called once). ValueError If any item in step_metrics is not of type PyMetric or tf_metric.TFStepMetric.

__call__

View source

__call__(
    *args
)

Method to update the metric contents.

To change the behavior of this function, override the call method.

Different subclasses might use this differently. For instance, the PyStepMetric takes in a trajectory, while the CounterMetric takes no parameters.

Args

*args See call method of subclass for specific arguments.