Raised when an operation has not been implemented.
Some operations may raise this error when passed otherwise-valid
arguments that it does not currently support. For example, running
would raise this error if pooling was requested on the batch dimension,
because this is not yet supported.
__init__( node_def, op, message )
The integer error code that describes the error.
The error message that describes the error.
NodeDef proto representing the op that failed.
The operation that failed, if known.
N.B. If the failed op was synthesized at runtime, e.g. a
Recv op, there will be no corresponding
object. In that case, this will return
None, and you should
instead use the
discover information about the op.
Operation that failed, or None.