code: def __call__(self, chunk_size=None):
      return self.new_tensor(None, None, raw_chunk_size=chunk_size)
  
file_path: mars/mars/tensor/random/dirichlet.py
imports: import itertools
  from collections.abc import Iterable
  import numpy
  from ...None import opcodes
  from ...serialization.serializables import TupleField
  from ...config import options
  from ..utils import decide_chunk_sizes, gen_random_seeds
  from .core import TensorRandomOperandMixin, TensorDistribution
label_desc: Use image node_id 2 for calling the TensorDirichlet obj's underlying member method code with example usage: obj.__call__(chunk_size) and returns: self