class_docstr: Apache Beam accumulator to compute the mean/stdev of svg commands.
class_docstr_tok: ["Apache","Beam","accumulator","to","compute","the","mean\/stdev","of","svg","commands","."]
code: def create_accumulator(self):
      curr_sum = np.zeros([10])
      sum_sq = np.zeros([10])
      return (curr_sum, sum_sq, 0)
  
imports: from absl import app
  from absl import flags
  import apache_beam
  from magenta.models.svg_vae import svg_utils
  import numpy
  from tensor2tensor.data_generators import generator_utils
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the MeanStddev obj's underlying member method code with example usage: obj.create_accumulator() and returns: curr_sum,  sum_sq,  int