class_docstr: A mechanism for cancelling blocking computation.
docstr: Cancels blocking operations that have been registered with this object.
code: def start_cancel(self):
      """Cancels blocking operations that have been registered with this object."""
      pywrap_tfe.TFE_CancellationManagerStartCancel(self._impl)
  
file_path: tensorflow/tensorflow/python/eager/cancellation.py
imports: from tensorflow.python import pywrap_tfe
label_desc: Use image node_id 3 for calling the CancellationManager obj's underlying member method code with example usage: obj.start_cancel() without return types