class_docstr: Compute pitch features of every frame in speech, return a float tensor
  with size (num_frames, 3).
code: def __init__(self, config: dict):
      super().__init__(config)
  
file_path: delta/delta/data/frontend/pitch.py
imports: import delta.compat
  from core.ops import py_x_ops
  from delta.utils.hparam import HParams
  from delta.data.frontend.base_frontend import BaseFrontend
label_desc: Use image node_id 1 to create a new Pitch object from inherited base classes: BaseFrontend with example: obj = Pitch(config)