tf.distribute.cluster_resolver.TFConfigClusterResolver

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Implementation of a ClusterResolver which reads the TF_CONFIG EnvVar.

Inherits From: ClusterResolver

tf.distribute.cluster_resolver.TFConfigClusterResolver(
    task_type=None, task_id=None, rpc_layer=None, environment=None
)

This is an implementation of cluster resolvers when using TF_CONFIG to set information about the cluster. The cluster spec returned will be initialized from the TF_CONFIG environment variable.

Args:

• task_type: (String, optional) Overrides the task type specified in the TF_CONFIG environment variable.
• task_id: (Integer, optional) Overrides the task index specified in the TF_CONFIG environment variable.
• rpc_layer: (String, optional) Overrides the rpc layer TensorFlow uses.
• environment: (String, optional) Overrides the environment TensorFlow operates in.

Attributes:

• environment: Returns the current environment which TensorFlow is running in.

  There are two possible return values, "google" (when TensorFlow is running in a Google-internal environment) or an empty string (when TensorFlow is running elsewhere).

  If you are implementing a ClusterResolver that works in both the Google environment and the open-source world (for instance, a TPU ClusterResolver or similar), you will have to return the appropriate string depending on the environment, which you will have to detect.

  Otherwise, if you are implementing a ClusterResolver that will only work in open-source TensorFlow, you do not need to implement this property.

• rpc_layer

• task_id

• task_type

Methods

cluster_spec

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cluster_spec()

Returns a ClusterSpec based on the TF_CONFIG environment variable.

Returns:

A ClusterSpec with information from the TF_CONFIG environment variable.

master

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master(
    task_type=None, task_id=None, rpc_layer=None
)

Returns the master address to use when creating a TensorFlow session.

Args:

• task_type: (String, optional) Overrides and sets the task_type of the master.
• task_id: (Integer, optional) Overrides and sets the task id of the master.
• rpc_layer: (String, optional) Overrides and sets the protocol over which TensorFlow nodes communicate with each other.

Returns:

The address of the master.

Raises:

• RuntimeError: If the task_type or task_id is not specified and the TF_CONFIG environment variable does not contain a task section.

num_accelerators

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num_accelerators(
    task_type=None, task_id=None, config_proto=None
)

Returns the number of accelerator cores per worker.

This returns the number of accelerator cores (such as GPUs and TPUs) available per worker.

Optionally, we allow callers to specify the task_type, and task_id, for if they want to target a specific TensorFlow process to query the number of accelerators. This is to support heterogenous environments, where the number of accelerators cores per host is different.

Args:

• task_type: (Optional) The type of the TensorFlow task of the machine we want to query.
• task_id: (Optional) The index of the TensorFlow task of the machine we want to query.
• config_proto: (Optional) Configuration for starting a new session to query how many accelerator cores it has.

Returns:

A map of accelerator types to number of cores.