class_docstr: Implements of grpc pipeline service.
code: def parse_input(
      self, input_model: "IOBase", content: "service_pb2.Content"
  ):
      if input_model is None:
          field_name = content.WhichOneof("content")
          if field_name == "text":
              input_model = TEXT()
          elif field_name == "tensor":
              input_model = NDARRAY()
          elif field_name == "content_bytes":
              input_model = BYTES()
          else:
              input_model = JSON()
      return input_model.from_proto(content)
  
imports: import typing
  import inspect
  import traceback
  from concurrent import futures
  from towhee.utils.thirdparty.grpc_utils import grpc
  from .None import service_pb2
  from .None import service_pb2_grpc
  from towhee.serve.io import JSON, TEXT, BYTES, NDARRAY
  from towhee.serve.api_service import RouterConfig
  from towhee.utils.log import engine_log
label_desc: Use image node_id 2 for calling the _PipelineImpl obj's underlying member method code with example usage: obj.parse_input(input_model, content) and returns: input_model