tf.sparse_segment_mean

tf.sparse_segment_mean(
    data,
    indices,
    segment_ids,
    name=None,
    num_segments=None
)

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

See the guide: Math > Segmentation

Computes the mean along sparse segments of a tensor.

Read the section on segmentation for an explanation of segments.

Like SegmentMean, but segment_ids can have rank less than data's first dimension, selecting a subset of dimension 0, specified by indices. segment_ids is allowed to have missing ids, in which case the output will be zeros at those indices. In those cases num_segments is used to determine the size of the output.

Args:

• data: A Tensor with data that will be assembled in the output.
• indices: A 1-D Tensor with indices into data. Has same rank as segment_ids.
• segment_ids: A 1-D Tensor with indices into the output Tensor. Values should be sorted and can be repeated.
• name: A name for the operation (optional).
• num_segments: An optional int32 scalar. Indicates the size of the output Tensor.

Returns:

A tensor of the shape as data, except for dimension 0 which has size k, the number of segments specified via num_segments or inferred for the last element in segments_ids.