code: def identity():
      return jnp.array([0.0, 0.0, 0.0, 1.0])
  
file_path: nerfies/nerfies/quaternion.py
imports: from jax import numpy
  from jax.numpy import linalg
label_desc: Use image node_id 4 for calling a global function with example usage: identity() and returns: jnp