class_docstr: Portal input for monkey-patching of mask in predict mode.
docstr: Initializes this layer's weights.
docstr_tok: ["Initializes","this","layer","'s","weights","."]
code: def init_weights_and_state(self, input_signature):
      """Initializes this layer's weights."""
      if isinstance(input_signature, (list, tuple)):
          input_signature = input_signature[0]
      self.state = (jnp.zeros(input_signature.shape),)
  
imports: import functools
  from trax import layers
  from trax.fastmath import numpy
  from trax.models.reformer import reformer
  from trax.models.research import configurable_transformer
  from trax.models.research import transformer2
label_desc: Use image node_id 3 for calling the _PortalInput obj's underlying member method code with example usage: obj.init_weights_and_state(input_signature) without return types