# tf.errors.UnimplementedError

### class tf.errors.UnimplementedError

See the guide: Running Graphs > Error classes and convenience functions

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 the tf.nn.max_pool operation would raise this error if pooling was requested on the batch dimension, because this is not yet supported.

## Properties

### error_code

The integer error code that describes the error.

### message

The error message that describes the error.

### node_def

The NodeDef proto representing the op that failed.

### op

The operation that failed, if known.

N.B. If the failed op was synthesized at runtime, e.g. a Send or Recv op, there will be no corresponding tf.Operation object. In that case, this will return None, and you should instead use the tf.OpError.node_def to discover information about the op.

#### Returns:

The Operation that failed, or None.

## Methods

### __init__(node_def, op, message)

Creates an UnimplementedError.