code: def __call__(self, chunk_size=None):
      return self.new_tensor(None, None, raw_chunk_size=chunk_size)
  
file_path: mars/mars/tensor/random/standard_exponential.py
imports: import numpy
  from ...None import opcodes
  from ..utils import gen_random_seeds
  from .core import TensorRandomOperandMixin, TensorDistribution
label_desc: Use image node_id 1 for calling the TensorStandardExponential obj's underlying member method code with example usage: obj.__call__(chunk_size) and returns: self