code: def validate_requirements_yaml(requirements_yaml):
      assert isinstance(
          requirements_yaml, dict
      ), "requirements.yaml contents must be a YAML dictionary"
      for package_entry in requirements_yaml.values():
          assert isinstance(package_entry, dict), (
              "Entry in requirements.yaml does not have required dictionary"
              f" structure: {package_entry}"
          )
          pip_release = package_entry.get("pip_release")
          assert pip_release is not None and isinstance(
              pip_release, str
          ), (
              "Entry in requirements.yaml does not define a valid 'pip_release'"
              f" string value: {package_entry}"
          )
          max_major_version = package_entry.get("max_major_version")
          assert max_major_version is not None and isinstance(
              max_major_version, int
          ), (
              "Entry in requirements.yaml does not specify a valid 'max_major_version'"
              f" integer value: {package_entry}"
          )
          if "minimum" in package_entry:
              assert isinstance(package_entry["minimum"], str), (
                  "Entry in requirements.yaml contains an invalid 'minimum' version"
                  f" string specification: {package_entry}"
              )
          if "unsupported" in package_entry:
              assert isinstance(
                  package_entry["unsupported"], list
              ) and all(
                  isinstance(unsupported_entry, str)
                  for unsupported_entry in package_entry["unsupported"]
              ), (
                  "Entry in requirements.yaml contains an invalid 'unsupported' versions"
                  " specification. Unsupported versions should be specified as lists of strings:"
                  f" {package_entry}"
              )
          if "markers" in package_entry:
              assert isinstance(package_entry["markers"], str), (
                  "Entry in requirements.yaml contains invalid 'markers' string"
                  f" specification: {package_entry}"
              )
  
imports: import argparse
  import sys
  import yaml
label_desc: Use image node_id 2 for calling a global function with example usage: validate_requirements_yaml(requirements_yaml) without return types