Flyte enables production-grade orchestration for machine learning workflows and data processing created to accelerate local workflows to production.

Flyte

I think it because of these None values:
``` 'timesteps_total': None,
 'episodes_total': None,```

ohh yeah, Flyte does not like Nones, we have been converting it to empty strings :sweat_smile:
maybe nested None doesnt work, but it should support Optional or None starting from 1.1 i think

yes, could you try Dict[str, Optional[Any]]

<@USU6W5ATA>, I tried and got:
```  File "/Users/fshen/hbo-code/dai-mle-models/env/lib/python3.8/site-packages/flytekit/core/type_engine.py", line 1060, in to_literal
    raise TypeError("Ambiguous choice of variant for union type")```

this is also a bit like a grab bag of entries.  would it be possible for you to convert it into a dataclass?

an untyped `dict` should do the trick here too

<@U019PBV483E>, how do you define a untyped dict in a return type? Like this?
```-&gt; typing.Dict```

<@U019PBV483E>, it works!
Thank you very much!

<@UNR3C6Y4T>, it could work. However, I don’t want the added efforts of defining the dataclass and the maintenance afterwards.

of course, the DictTransformer is very versatile - I ran into the same issue before, but found this fix!