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+### `tf.contrib.metrics.set_union(a, b, validate_indices=True)` {#set_union}
+
+Compute set union of elements in last dimension of `a` and `b`.
+
+All but the last dimension of `a` and `b` must match.
+
+##### Args:
+
+
+*  <b>`a`</b>: `Tensor` or `SparseTensor` of the same type as `b`. If sparse, indices
+      must be sorted in row-major order.
+*  <b>`b`</b>: `Tensor` or `SparseTensor` of the same type as `a`. Must be
+      `SparseTensor` if `a` is `SparseTensor`. If sparse, indices must be
+      sorted in row-major order.
+*  <b>`validate_indices`</b>: Whether to validate the order and range of sparse indices
+     in `a` and `b`.
+
+##### Returns:
+
+  A `SparseTensor` with the same rank as `a` and `b`, and all but the last
+  dimension the same. Elements along the last dimension contain the
+  unions.
+