code: def _f(x):
      return np.asarray(x, dtype=np.float32)
  
file_path: nnabla/python/test/solver/test_lion.py
imports: import pytest
  import nnabla.solvers
  import numpy
  from solver_test_utils import solver_tester, RefSolver, MixinWeightDecayFused
  from nbla_test_utils import list_context
label_desc: Use image node_id 1 for calling a global function with example usage: _f(x) and returns: np