code: def short_name(b):
      if b == fastmath.Backend.JAX:
          return "jax"
      else:
          return "tf"
  
imports: import functools
  from absl.testing import absltest
  from absl.testing import parameterized
  import gin
  import numpy
  from trax import fastmath
  from trax import layers
  from trax import shapes
  from trax.layers import test_utils
  from trax.models.research import terraformer
label_desc: Use image node_id 1 for calling a global function with example usage: short_name(b) and returns: str, str