Issues with Hydra Configuration file in Google Collab

[Elappnano]

Hi, to implement the app in the google colab I used

from hydra import initialize, compose
if __name__ == "__main__":
    with initialize(version_base=None, config_path="configs"):
        cfg = compose(config_name="config.yaml")
        main(cfg)

but the following error is raised.

---------------------------------------------------------------------------
InterpolationResolutionError              Traceback (most recent call last)
[<ipython-input-28-7740892df83b>](https://localhost:8080/#) in <cell line: 2>()
      3     with initialize(version_base=None, config_path="configs"):
      4         cfg = compose(config_name="config.yaml")
----> 5         main(cfg)

28 frames
[<ipython-input-2-39423ea7b27c>](https://localhost:8080/#) in main(cfg)
     75     # apply extra utilities
     76     # (e.g. ask for tags if none are provided in cfg, print cfg tree, etc.)
---> 77     pinnstf2.utils.extras(cfg)
     78 
     79     # train the model

[/usr/local/lib/python3.10/dist-packages/pinnstf2/utils/utils.py](https://localhost:8080/#) in extras(cfg)
     36     if cfg.extras.get("enforce_tags"):
     37         log.info("Enforcing tags! <cfg.extras.enforce_tags=True>")
---> 38         rich_utils.enforce_tags(cfg, save_to_file=True)
     39 
     40     # pretty print config tree using Rich library

[/usr/local/lib/python3.10/dist-packages/pinnstf2/utils/rich_utils.py](https://localhost:8080/#) in enforce_tags(cfg, save_to_file)
     93 
     94     if save_to_file:
---> 95         with open(Path(cfg.paths.output_dir, "tags.log"), "w") as file:
     96             rich.print(cfg.tags, file=file)

[/usr/local/lib/python3.10/dist-packages/omegaconf/dictconfig.py](https://localhost:8080/#) in __getattr__(self, key)
    357             )
    358         except Exception as e:
--> 359             self._format_and_raise(key=key, value=None, cause=e)
    360 
    361     def __getitem__(self, key: DictKeyType) -> Any:

[/usr/local/lib/python3.10/dist-packages/omegaconf/base.py](https://localhost:8080/#) in _format_and_raise(self, key, value, cause, msg, type_override)
    229         type_override: Any = None,
    230     ) -> None:
--> 231         format_and_raise(
    232             node=self,
    233             key=key,

[/usr/local/lib/python3.10/dist-packages/omegaconf/_utils.py](https://localhost:8080/#) in format_and_raise(node, key, value, msg, cause, type_override)
    897         ex.ref_type_str = ref_type_str
    898 
--> 899     _raise(ex, cause)
    900 
    901 

[/usr/local/lib/python3.10/dist-packages/omegaconf/_utils.py](https://localhost:8080/#) in _raise(ex, cause)
    795     else:
    796         ex.__cause__ = None
--> 797     raise ex.with_traceback(sys.exc_info()[2])  # set env var OC_CAUSE=1 for full trace
    798 
    799 

[/usr/local/lib/python3.10/dist-packages/omegaconf/dictconfig.py](https://localhost:8080/#) in __getattr__(self, key)
    349 
    350         try:
--> 351             return self._get_impl(
    352                 key=key, default_value=_DEFAULT_MARKER_, validate_key=False
    353             )

[/usr/local/lib/python3.10/dist-packages/omegaconf/dictconfig.py](https://localhost:8080/#) in _get_impl(self, key, default_value, validate_key)
    449                 raise
    450         assert isinstance(node, Node)
--> 451         return self._resolve_with_default(
    452             key=key, value=node, default_value=default_value
    453         )

[/usr/local/lib/python3.10/dist-packages/omegaconf/basecontainer.py](https://localhost:8080/#) in _resolve_with_default(self, key, value, default_value)
     96             raise MissingMandatoryValue("Missing mandatory value: $FULL_KEY")
     97 
---> 98         resolved_node = self._maybe_resolve_interpolation(
     99             parent=self,
    100             key=key,

[/usr/local/lib/python3.10/dist-packages/omegaconf/base.py](https://localhost:8080/#) in _maybe_resolve_interpolation(self, parent, key, value, throw_on_resolution_failure, memo)
    717 
    718         parse_tree = parse(_get_value(value))
--> 719         return self._resolve_interpolation_from_parse_tree(
    720             parent=parent,
    721             value=value,

[/usr/local/lib/python3.10/dist-packages/omegaconf/base.py](https://localhost:8080/#) in _resolve_interpolation_from_parse_tree(self, parent, value, key, parse_tree, throw_on_resolution_failure, memo)
    582 
    583         try:
--> 584             resolved = self.resolve_parse_tree(
    585                 parse_tree=parse_tree, node=value, key=key, memo=memo
    586             )

[/usr/local/lib/python3.10/dist-packages/omegaconf/base.py](https://localhost:8080/#) in resolve_parse_tree(self, parse_tree, node, memo, key)
    767         except Exception as exc:
    768             # Other kinds of exceptions are wrapped in an `InterpolationResolutionError`.
--> 769             raise InterpolationResolutionError(
    770                 f"{type(exc).__name__} raised while resolving interpolation: {exc}"
    771             ).with_traceback(sys.exc_info()[2])

[/usr/local/lib/python3.10/dist-packages/omegaconf/base.py](https://localhost:8080/#) in resolve_parse_tree(self, parse_tree, node, memo, key)
    762         )
    763         try:
--> 764             return visitor.visit(parse_tree)
    765         except InterpolationResolutionError:
    766             raise

[/usr/local/lib/python3.10/dist-packages/antlr4/tree/Tree.py](https://localhost:8080/#) in visit(self, tree)
     32 class ParseTreeVisitor(object):
     33     def visit(self, tree):
---> 34         return tree.accept(self)
     35 
     36     def visitChildren(self, node):

[/usr/local/lib/python3.10/dist-packages/omegaconf/grammar/gen/OmegaConfGrammarParser.py](https://localhost:8080/#) in accept(self, visitor)
    204         def accept(self, visitor:ParseTreeVisitor):
    205             if hasattr( visitor, "visitConfigValue" ):
--> 206                 return visitor.visitConfigValue(self)
    207             else:
    208                 return visitor.visitChildren(self)

[/usr/local/lib/python3.10/dist-packages/omegaconf/grammar_visitor.py](https://localhost:8080/#) in visitConfigValue(self, ctx)
     99         # text EOF
    100         assert ctx.getChildCount() == 2
--> 101         return self.visit(ctx.getChild(0))
    102 
    103     def visitDictKey(self, ctx: OmegaConfGrammarParser.DictKeyContext) -> Any:

[/usr/local/lib/python3.10/dist-packages/antlr4/tree/Tree.py](https://localhost:8080/#) in visit(self, tree)
     32 class ParseTreeVisitor(object):
     33     def visit(self, tree):
---> 34         return tree.accept(self)
     35 
     36     def visitChildren(self, node):

[/usr/local/lib/python3.10/dist-packages/omegaconf/grammar/gen/OmegaConfGrammarParser.py](https://localhost:8080/#) in accept(self, visitor)
    340         def accept(self, visitor:ParseTreeVisitor):
    341             if hasattr( visitor, "visitText" ):
--> 342                 return visitor.visitText(self)
    343             else:
    344                 return visitor.visitChildren(self)

[/usr/local/lib/python3.10/dist-packages/omegaconf/grammar_visitor.py](https://localhost:8080/#) in visitText(self, ctx)
    296             c = ctx.getChild(0)
    297             if isinstance(c, OmegaConfGrammarParser.InterpolationContext):
--> 298                 return self.visitInterpolation(c)
    299 
    300         # Otherwise, concatenate string representations together.

[/usr/local/lib/python3.10/dist-packages/omegaconf/grammar_visitor.py](https://localhost:8080/#) in visitInterpolation(self, ctx)
    123     ) -> Any:
    124         assert ctx.getChildCount() == 1  # interpolationNode | interpolationResolver
--> 125         return self.visit(ctx.getChild(0))
    126 
    127     def visitInterpolationNode(

[/usr/local/lib/python3.10/dist-packages/antlr4/tree/Tree.py](https://localhost:8080/#) in visit(self, tree)
     32 class ParseTreeVisitor(object):
     33     def visit(self, tree):
---> 34         return tree.accept(self)
     35 
     36     def visitChildren(self, node):

[/usr/local/lib/python3.10/dist-packages/omegaconf/grammar/gen/OmegaConfGrammarParser.py](https://localhost:8080/#) in accept(self, visitor)
   1039         def accept(self, visitor:ParseTreeVisitor):
   1040             if hasattr( visitor, "visitInterpolationResolver" ):
-> 1041                 return visitor.visitInterpolationResolver(self)
   1042             else:
   1043                 return visitor.visitChildren(self)

[/usr/local/lib/python3.10/dist-packages/omegaconf/grammar_visitor.py](https://localhost:8080/#) in visitInterpolationResolver(self, ctx)
    177                 args_str.append(txt)
    178 
--> 179         return self.resolver_interpolation_callback(
    180             name=resolver_name,
    181             args=tuple(args),

[/usr/local/lib/python3.10/dist-packages/omegaconf/base.py](https://localhost:8080/#) in resolver_interpolation_callback(name, args, args_str)
    748             name: str, args: Tuple[Any, ...], args_str: Tuple[str, ...]
    749         ) -> Any:
--> 750             return self._evaluate_custom_resolver(
    751                 key=key,
    752                 node=node,

[/usr/local/lib/python3.10/dist-packages/omegaconf/base.py](https://localhost:8080/#) in _evaluate_custom_resolver(self, key, node, inter_type, inter_args, inter_args_str)
    692         if resolver is not None:
    693             root_node = self._get_root()
--> 694             return resolver(
    695                 root_node,
    696                 self,

[/usr/local/lib/python3.10/dist-packages/omegaconf/omegaconf.py](https://localhost:8080/#) in resolver_wrapper(config, parent, node, args, args_str)
    443                 kwargs["_root_"] = config
    444 
--> 445             ret = resolver(*args, **kwargs)
    446 
    447             if use_cache:

[/usr/local/lib/python3.10/dist-packages/hydra/core/utils.py](https://localhost:8080/#) in <lambda>(path)
    218     OmegaConf.register_new_resolver(
    219         "hydra",
--> 220         lambda path: OmegaConf.select(cast(DictConfig, HydraConfig.get()), path),
    221         replace=True,
    222     )

[/usr/local/lib/python3.10/dist-packages/hydra/core/hydra_config.py](https://localhost:8080/#) in get()
     29         instance = HydraConfig.instance()
     30         if instance.cfg is None:
---> 31             raise ValueError("HydraConfig was not set")
     32         return instance.cfg.hydra  # type: ignore
     33 
InterpolationResolutionError: ValueError raised while resolving interpolation: HydraConfig was not set
    full_key: paths.output_dir
    object_type=dict

I'm not sure what's going wrong with hydra setup that raises this problem, and I'd very much appreciate any help on this. Thanks!