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tf.tpu.experimental.DeviceAssignment

Mapping from logical cores in a computation to the physical TPU topology.

Prefer to use the DeviceAssignment.build() helper to construct a DeviceAssignment; it is easier if less flexible than constructing a DeviceAssignment directly.

Args
topology A Topology object that describes the physical TPU topology.
core_assignment A logical to physical core mapping, represented as a rank 3 numpy array. See the description of the core_assignment property for more details.
Raises
ValueError If topology is not Topology object.
ValueError If core_assignment is not a rank 3 numpy array.
Attributes
core_assignment The logical to physical core mapping.
num_cores_per_replica The number of cores per replica.
num_replicas The number of replicas of the computation.
topology A Topology that describes the TPU topology.

Methods

build

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coordinates

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Returns the physical topology coordinates of a logical core.

host_device

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Returns the CPU device attached to a logical core.

lookup_replicas

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Lookup replica ids by task number and logical core.

Args
task_id TensorFlow task number.
logical_core An integer, identifying a logical core.
Returns
A sorted list of the replicas that are attached to that task and logical_core.
Raises
ValueError If no replica exists in the task which contains the logical core.

tpu_device

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Returns the name of the TPU device assigned to a logical core.

tpu_ordinal

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Returns the ordinal of the TPU device assigned to a logical core.

© 2020 The TensorFlow Authors. All rights reserved.
Licensed under the Creative Commons Attribution License 3.0.
Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/versions/r2.4/api_docs/python/tf/tpu/experimental/DeviceAssignment