docstr: Test initialization of the GSS mask estimator and make sure it can process an input tensor.
  This tests initialization and the output shape. It does not test correctness of the output.
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code: def test_gss(
      self,
      num_channels: int,
      num_subbands: int,
      num_outputs: int,
      batch_size: int,
  ):
      """Test initialization of the GSS mask estimator and make sure it can process an input tensor.
      This tests initialization and the output shape. It does not test correctness of the output.
      """
      # Test vector length
      num_frames = 50
  
      # Instantiate UUT
      uut = MaskEstimatorGSS()
  
      # Process the current configuration
      logging.debug("Process num_channels=%d", num_channels)
      input_size = (batch_size, num_channels, num_subbands, num_frames)
      logging.debug("Input size: %s", input_size)
  
      # multi-channel input
      mixture_spec = torch.randn(input_size, dtype=torch.cfloat)
      source_activity = (
          torch.randn(batch_size, num_outputs, num_frames) > 0
      )
  
      # UUT
      mask = uut(input=mixture_spec, activity=source_activity)
  
      # Check output dimensions match
      expected_mask_shape = (
          batch_size,
          num_outputs,
          num_subbands,
          num_frames,
      )
      assert (
          mask.shape == expected_mask_shape
      ), f"Output shape mismatch: expected {expected_mask_shape}, got {mask.shape}"
  
imports: import importlib
  from typing import Optional
  import numpy
  import pytest
  import torch
  from nemo.collections.asr.modules.audio_modules import MaskBasedDereverbWPE, MaskEstimatorFlexChannels, MaskEstimatorGSS, MaskReferenceChannel, SpectrogramToMultichannelFeatures, WPEFilter
  from nemo.collections.asr.modules.audio_preprocessing import AudioToSpectrogram
  from nemo.collections.asr.parts.utils.audio_utils import convmtx_mc_numpy
  from nemo.utils import logging
label_desc: Use image node_id 2 for calling the TestMaskEstimator obj's underlying member method code with example usage: obj.test_gss(num_channels, num_subbands, num_outputs, batch_size) without return types