Class StackingSensor

Sensor that wraps around another Sensor to provide temporal stacking. Conceptually, consecutive observations are stored left-to-right, which is how they're output For example, 4 stacked sets of observations would be output like | t = now - 3 | t = now -3 | t = now - 2 | t = now | Internally, a circular buffer of arrays is used. The m_CurrentIndex represents the most recent observation. Currently, observations are stacked on the last dimension.

Inheritance
object
StackingSensor
Implements
Inherited Members
Namespace: Unity.MLAgents.Sensors
Assembly: Unity.ML-Agents.dll
Syntax
public class StackingSensor : ISensor

Constructors

StackingSensor(ISensor, int)

Initializes the sensor.

Declaration
public StackingSensor(ISensor wrapped, int numStackedObservations)
Parameters
Type Name Description
ISensor wrapped

The wrapped sensor.
int numStackedObservations

Number of stacked observations to keep.

Methods

GetBuiltInSensorType()

Return the corresponding BuiltInSensorType for the sensor.

Declaration
public BuiltInSensorType GetBuiltInSensorType()
Returns
Type Description
BuiltInSensorType

A BuiltInSensorType corresponding to the sensor.

GetCompressedObservation()

Return a compressed representation of the observation. For small observations, this should generally not be implemented. However, compressing large observations (such as visual results) can significantly improve model training time.

Declaration
public byte[] GetCompressedObservation()
Returns
Type Description
byte[]

Compressed observation.

GetCompressionSpec()

Return information on the compression type being used. If no compression is used, return Default().

Declaration
public CompressionSpec GetCompressionSpec()
Returns
Type Description
CompressionSpec

An object describing the compression used by the sensor.

GetName()

Get the name of the sensor. This is used to ensure deterministic sorting of the sensors on an Agent, so the naming must be consistent across all sensors and agents.

Declaration
public string GetName()
Returns
Type Description
string

The name of the sensor.

GetObservationSpec()

Returns a description of the observations that will be generated by the sensor. See ObservationSpec for more details, and helper methods to create one.

Declaration
public ObservationSpec GetObservationSpec()
Returns
Type Description
ObservationSpec

An object describing the observation.

Reset()

Resets the internal state of the sensor. This is called at the end of an Agent's episode. Most implementations can leave this empty.

Declaration
public void Reset()

Update()

Updates the index of the "current" buffer.

Declaration
public void Update()

Write(ObservationWriter)

Write the observation data directly to the ObservationWriter. Note that this (and GetCompressedObservation()) may be called multiple times per agent step, so should not mutate any internal state.

Declaration
public int Write(ObservationWriter writer)
Parameters
Type Name Description
ObservationWriter writer

Where the observations will be written to.
Returns
Type Description
int

The number of elements written.

Implements

Extension Methods