code: def _simplify_param(theta, gate):
      r"""Check if the parameter allows simplification for the rotation gate.
  
      For the cases where theta is an integer multiple of π: (a) returns a global phase
      when even, and (b) returns combination of provided gate with global phase when odd.
      In rest of the other cases it would return None.
      """
      if qml.math.is_abstract(theta):  # pragma: no cover
          return None
  
      if qml.math.allclose(theta, 0.0, atol=1e-6):
          return [qml.GlobalPhase(0.0)]
  
      rem_, mod_ = qml.math.divide(theta, math.pi), qml.math.mod(
          theta, math.pi
      )
      if qml.math.allclose(mod_, 0.0, atol=1e-6):
          ops = [qml.GlobalPhase(theta / 2)]
          if qml.math.allclose(qml.math.mod(rem_, 2), 1.0, atol=1e-6):
              ops.append(gate)
          return ops
  
      return None
  
file_path: pennylane/pennylane/transforms/decompositions/clifford_t_transform.py
imports: import math
  import warnings
  from itertools import product
  from typing import Sequence, Callable
  import pennylane
  from pennylane.queuing import QueuingManager
  from pennylane.transforms.core import transform
  from pennylane.tape import QuantumTape
  from pennylane.transforms.optimization import cancel_inverses, commute_controlled, merge_rotations, remove_barrier
  from pennylane.transforms.optimization.optimization_utils import find_next_gate, _fuse_global_phases
  from pennylane.ops.op_math.decompositions.solovay_kitaev import sk_decomposition
label_desc: Use image node_id 3 for calling a global function with example usage: _simplify_param(theta, gate) and returns: None, None, list, ops