Update 'ref' by assigning 'value' to it.

Update 'ref' by adding 'value' to it.

Update 'ref' by subtracting 'value' from it.

Increments 'ref' until it reaches 'limit'.

Destroys the temporary variable and returns its final value.

Checks whether a tensor has been initialized.

Adds sparse updates to a variable reference.

Divides a variable reference by sparse updates.

Multiplies sparse updates into a variable reference.

Applies sparse addition between updates and individual values or slices.

Applies sparse subtraction between updates and individual values or slices.

Applies sparse updates to individual values or slices within a given.

Subtracts sparse updates to a variable reference.

Applies sparse updates to a variable reference.

Returns a tensor that may be mutated, but only persists within a single step.

Holds state in the form of a tensor that persists across steps.