code: def size(self):
      return util.product(xs=self.shape)
  
imports: from functools import total_ordering
  import numpy
  import tensorflow
  from tensorforce import TensorforceError, util
  from tensorforce.core.utils import tf_util
label_desc: Use image node_id 4 for calling the TensorSpec obj's underlying member method code with example usage: obj.size() and returns: util