code: def _get_out_chunk(cls, op, in_chunk):
      chunk_op = op.copy().reset_key()
      out_chunk_shape = (0,) * in_chunk.ndim
      return chunk_op.new_chunk(
          [in_chunk],
          out_chunk_shape,
          index=in_chunk.index,
          order=op.outputs[0].order,
      )
  
file_path: mars/mars/tensor/datastore/core.py
imports: from ..operands import TensorHasInput, TensorOperandMixin
label_desc: Use image node_id 3 for calling the TensorDataStore obj's underlying member method code with example usage: obj._get_out_chunk(cls, op, in_chunk) and returns: chunk_op