code: def calc_voxel_count(input_data, mask_value=0):
      input_data = read_image_files(input_data)
  
      return input_data[input_data != mask_value].size
  
file_path: DeepNeuro/deepneuro/outputs/measure.py
imports: import numpy
  from skimage.morphology import label
  from skimage.measure import regionprops, mesh_surface_area, marching_cubes
  from scipy import signal
  from deepneuro.utilities.conversion import read_image_files
label_desc: Use image node_id 5 for calling a global function with example usage: calc_voxel_count(input_data, mask_value) and returns: input_data