code: def _np_inverse_stft(stft, fft_length, hop_length, window_length):
      frames = np.fft.irfft(stft, fft_length)
      # Pad or truncate frames's inner dimension to window_length.
      frames = frames[..., :window_length]
      frames = np.pad(
          frames,
          [[0, 0]] * (frames.ndim - 1)
          + [[0, max(0, window_length - frames.shape[-1])]],
          "constant",
      )
      window = SpectralOpsTest._np_hann_periodic_window(window_length)
      return SpectralOpsTest._np_overlap_add(
          frames * window, hop_length
      )
  
imports: import itertools
  from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import context
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradient_checker_v2
  from tensorflow.python.ops import gradients_impl
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops.signal import spectral_ops
  from tensorflow.python.ops.signal import window_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the SpectralOpsTest obj's underlying member method code with example usage: obj._np_inverse_stft(stft, fft_length, hop_length, window_length) and returns: SpectralOpsTest