tf.compat.v1.assign_sub

Update ref by subtracting value from it.

tf.compat.v1.assign_sub(
    ref, value, use_locking=None, name=None
)

This operation outputs ref after the update is done. This makes it easier to chain operations that need to use the reset value. Unlike tf.math.subtract, this op does not broadcast. ref and value must have the same shape.

Args
ref	A mutable Tensor. Must be one of the following types: float32, float64, int64, int32, uint8, uint16, int16, int8, complex64, complex128, qint8, quint8, qint32, half. Should be from a Variable node.
value	A Tensor. Must have the same shape and dtype as ref. The value to be subtracted to the variable.
use_locking	An optional bool. Defaults to False. If True, the subtraction will be protected by a lock; otherwise the behavior is undefined, but may exhibit less contention.
name	A name for the operation (optional).

Returns
Same as "ref". Returned as a convenience for operations that want to use the new value after the variable has been updated.