ParallelDynamicStitch

public final class ParallelDynamicStitch

Interleave the values from the `data` tensors into a single tensor.

Builds a merged tensor such that 

merged[indices[m][i, ..., j], ...] = data[m][i, ..., j, ...]
For example, if each `indices[m]` is scalar or vector, we have 
# Scalar indices:
     merged[indices[m], ...] = data[m][...]
 
     # Vector indices:
     merged[indices[m][i], ...] = data[m][i, ...]
Each `data[i].shape` must start with the corresponding `indices[i].shape`, and the rest of `data[i].shape` must be constant w.r.t. `i`. That is, we must have `data[i].shape = indices[i].shape + constant`. In terms of this `constant`, the output shape is

merged.shape = [max(indices)] + constant

Values may be merged in parallel, so if an index appears in both `indices[m][i]` and `indices[n][j]`, the result may be invalid. This differs from the normal DynamicStitch operator that defines the behavior in that case.

For example: 

indices[0] = 6
     indices[1] = [4, 1]
     indices[2] = [[5, 2], [0, 3]]
     data[0] = [61, 62]
     data[1] = [[41, 42], [11, 12]]
     data[2] = [[[51, 52], [21, 22]], [[1, 2], [31, 32]]]
     merged = [[1, 2], [11, 12], [21, 22], [31, 32], [41, 42],
               [51, 52], [61, 62]]
This method can be used to merge partitions created by `dynamic_partition` as illustrated on the following example: 
# Apply function (increments x_i) on elements for which a certain condition
     # apply (x_i != -1 in this example).
     x=tf.constant([0.1, -1., 5.2, 4.3, -1., 7.4])
     condition_mask=tf.not_equal(x,tf.constant(-1.))
     partitioned_data = tf.dynamic_partition(
         x, tf.cast(condition_mask, tf.int32) , 2)
     partitioned_data[1] = partitioned_data[1] + 1.0
     condition_indices = tf.dynamic_partition(
         tf.range(tf.shape(x)[0]), tf.cast(condition_mask, tf.int32) , 2)
     x = tf.dynamic_stitch(condition_indices, partitioned_data)
     # Here x=[1.1, -1., 6.2, 5.3, -1, 8.4], the -1. values remain
     # unchanged.

Public Methods

Output<T>
asOutput()
Returns the symbolic handle of a tensor.
static <T> ParallelDynamicStitch<T>
create(Scope scope, Iterable<Operand<Integer>> indices, Iterable<Operand<T>> data)
Factory method to create a class wrapping a new ParallelDynamicStitch operation.
Output<T>
merged()

Inherited Methods

Public Methods

public Output<T> asOutput ()

Returns the symbolic handle of a tensor.

Inputs to TensorFlow operations are outputs of another TensorFlow operation. This method is used to obtain a symbolic handle that represents the computation of the input.

public static ParallelDynamicStitch<T> create (Scope scope, Iterable<Operand<Integer>> indices, Iterable<Operand<T>> data)

Factory method to create a class wrapping a new ParallelDynamicStitch operation.

Parameters
scope current scope
Returns
  • a new instance of ParallelDynamicStitch

public Output<T> merged ()