class_docstr: ASR Task 
class_docstr_tok: ["ASR","Task"]
docstr: Feature shape. 
docstr_tok: ["Feature","shape","."]
code: def feat_shape(self):
      """Feature shape."""
      assert isinstance(self._feat_shape, (list))
      return self._feat_shape
  
imports: import numpy
  import delta.compat
  from absl import logging
  from delta import utils
  from delta.data.utils import espnet_utils
  from delta.utils.register import registers
  from delta.data.task.base_speech_task import SpeechTask
label_desc: Use image node_id 3 for calling the AsrSeqTask obj's underlying member method code with example usage: obj.feat_shape() and returns: self