/TensorFlow Python



Defined in tensorflow/python/ops/gen_state_ops.py.

See the guide: Variables > Sparse Variable Updates

Reduces sparse updates into a variable reference using the max operation.

This operation computes

# Scalar indices
ref[indices, ...] = max(ref[indices, ...], updates[...])

# Vector indices (for each i)
ref[indices[i], ...] = max(ref[indices[i], ...], updates[i, ...])

# High rank indices (for each i, ..., j)
ref[indices[i, ..., j], ...] = max(ref[indices[i, ..., j], ...], updates[i, ..., j, ...])

This operation outputs ref after the update is done. This makes it easier to chain operations that need to use the reset value.

Duplicate entries are handled correctly: if multiple indices reference the same location, their contributions combine.

Requires updates.shape = indices.shape + ref.shape[1:] or updates.shape = [].


  • ref: A mutable Tensor. Must be one of the following types: half, bfloat16, float32, float64, int32, int64. Should be from a Variable node.
  • indices: A Tensor. Must be one of the following types: int32, int64. A tensor of indices into the first dimension of ref.
  • updates: A Tensor. Must have the same type as ref. A tensor of updated values to reduce into ref.
  • use_locking: An optional bool. Defaults to False. If True, the update will be protected by a lock; otherwise the behavior is undefined, but may exhibit less contention.
  • name: A name for the operation (optional).


A mutable Tensor. Has the same type as ref.

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Licensed under the Creative Commons Attribution License 3.0.
Code samples licensed under the Apache 2.0 License.