class_docstr: The first layer in any network.
  
  Parameters
  ----------
  size : tuple
      the size of the input.
code: def __str__(self):
      return f"InputLayer(input_size={self.input_size}, output_size={self.output_size})"
  
imports: import itertools
  import numpy
label_desc: Use image node_id 2 for calling the InputLayer obj's underlying member method code with example usage: obj.__str__() and returns: str, self, str, self, str