Hydra composition writes scientific float without decimal point which is parsed by YAML as str

Bug Report

Description

When using the Hydra Composition, float numbers in the input config files in scientific format, e.g., 1.0e-5 are written to the generated params.yaml file as 1e-5. The latter is parsed as a str instead of a float. The decimal point is required.

Reproduce

conf/config.yaml

number: 1.0e-5

test.py

from pathlib import Path
import yaml

text = Path("params.yaml").read_text()
config = yaml.load(text, Loader=yaml.SafeLoader)
assert isinstance(config["number"], float)

dvc.yaml

stages:
  test:
    cmd: python test.py

dvc exp run test

Generated params.yaml:

number: 1e-5

Expected

Environment information

Output of dvc doctor:

$ dvc doctor
DVC version: 2.30.0 (rpm)
---------------------------------
Platform: Python 3.8.3 on Linux-3.10.0-1160.15.2.el7.x86_64-x86_64-with-glibc2.14
Subprojects:

Supports:
        azure (adlfs = None, knack = 0.10.0, azure-identity = None),
        gdrive (pydrive2 = 1.14.0),
        gs (gcsfs = None),
        hdfs (fsspec = None, pyarrow = 9.0.0),
        http (aiohttp = None, aiohttp-retry = 2.8.3),
        https (aiohttp = None, aiohttp-retry = 2.8.3),
        oss (ossfs = 2021.8.0),
        s3 (s3fs = None, boto3 = None),
        ssh (sshfs = 2022.6.0),
        webdav (webdav4 = 0.9.7),
        webdavs (webdav4 = 0.9.7),
        webhdfs (fsspec = None)
Cache types: hardlink, symlink
Cache directory: xfs on /dev/md124
Caches: local, s3
Remotes: s3, s3
Workspace directory: xfs on /dev/md124
Repo: dvc (subdir), git

Additional Information (if any):

[aschuh-hf]

OK, I think I understand now. The conclusion is that the params.yaml you produce requires a YAML 1.2 compatible reader. And PyYAML is not, which is what I use in my code currently. Switching to ruaml.yaml will fix it. Got it 😃

[aschuh-hf]

But when I install DVC from YUM repo, does it not use its own virtual environment / libraries in /usr/lib/dvc?