docstr: Test inputting a vector of zeros
  
  Inputting zeros should return the cutoff value from UnaryOperator (i.e., 1e-30).
  https://essentia.upf.edu/reference/std_UnaryOperator.html
code: def testZeroSpectrum(self):
      """Test inputting a vector of zeros
  
      Inputting zeros should return the cutoff value from UnaryOperator (i.e., 1e-30).
      https://essentia.upf.edu/reference/std_UnaryOperator.html
      """
  
      log_cutoff = -30
  
      self.assertEqualVector(
          TensorflowInputFSDSINet()(zeros(self.frame_size)),
          log_cutoff * ones(self.n_bands),
      )
  
file_path: essentia/test/src/unittests/spectral/test_tensorflowinputfsdsinet.py
imports: from essentia_test import *
label_desc: Use image node_id 2 for calling the TestTensorflowInputFSDSINet obj's underlying member method code with example usage: obj.testZeroSpectrum() without return types