How to use inf value in yaml

[nicolas-dufour]

🐛 Bug

Description

When writing a yaml file, inf is not interprated as a float but as an str

with

foo: inf

when imported in python type(foo) == str

The doc however specify that inf type is supported

Checklist

• I checked on the latest version of Hydra
• I created a minimal repro (See this for tips).

Expected Behavior

I would expect cfg.foo == float("inf")

System information

• Hydra 1.2
• python 3.10
• Linux

[Jasha10]

Hi @nicolas-dufour,
See Example 10.7 from the yaml spec:

infinity: !!float .inf

Here it is in action:

>>> cfg = OmegaConf.create("foo: !!float .inf")
>>> cfg.foo
inf

Hydra uses pyyaml for parsing, and it seems that with pyyaml you can omit the !!float prefix:

infinity: .inf

>>> cfg = OmegaConf.create("foo: .inf")
>>> cfg.foo
inf
>>> import math
>>> math.isfinite(cfg.foo)
False

[nicolas-dufour]

Thanks! This worked out for me!