code: def parseTemplateYaml(self, yaml_file: str) -> None:
      with open(yaml_file) as f:
          contents = yaml.load(f, Loader=UniqueKeyLoader)
          for template_name, params_dict in contents.items():
              if template_name in self.shader_template_params:
                  raise KeyError(
                      f"{template_name} params file is defined twice"
                  )
  
              default_params = params_dict[
                  "parameter_names_with_default_values"
              ]
              params_names = set(default_params.keys()).union({"NAME"})
  
              self.shader_template_params[template_name] = []
  
              default_iterated_params = params_dict.get(
                  "generate_variant_forall", None
              )
  
              for variant in params_dict["shader_variants"]:
                  variant_params_names = set(variant.keys())
                  invalid_keys = (
                      variant_params_names
                      - params_names
                      - {"generate_variant_forall"}
                  )
                  assert len(invalid_keys) == 0
  
                  iterated_params = variant.get(
                      "generate_variant_forall", default_iterated_params
                  )
  
                  if iterated_params is not None:
                      variant_combinations = (
                          self.generateVariantCombinations(
                              iterated_params, variant_params_names
                          )
                      )
  
                      for combination in variant_combinations:
                          default_params_copy = copy.deepcopy(
                              default_params
                          )
                          for key in variant:
                              if key != "generate_variant_forall":
                                  default_params_copy[key] = variant[
                                      key
                                  ]
  
                          variant_name = variant["NAME"]
                          for param_value in combination:
                              default_params_copy[
                                  param_value[0]
                              ] = param_value[2]
                              if len(param_value[1]) > 0:
                                  variant_name = (
                                      f"{variant_name}_{param_value[1]}"
                                  )
  
                          default_params_copy["NAME"] = variant_name
  
                          self.shader_template_params[
                              template_name
                          ].append(default_params_copy)
                  else:
                      default_params_copy = copy.deepcopy(
                          default_params
                      )
                      for key in variant:
                          default_params_copy[key] = variant[key]
  
                      self.shader_template_params[template_name].append(
                          default_params_copy
                      )
  
imports: import argparse
  import array
  import codecs
  import copy
  import glob
  import io
  import os
  import re
  import sys
  from itertools import product
  import subprocess
  import textwrap
  from dataclasses import dataclass
  from typing import Any, Dict, List, Optional, Set, Tuple, Union
  import yaml
  from yaml.constructor import ConstructorError
  from yaml.nodes import MappingNode
label_desc: Use image node_id 4 for calling the SPVGenerator obj's underlying member method code with example usage: obj.parseTemplateYaml(yaml_file) without return types