If you already been following some of the best practices in Deep Learning, Facebook's Hydra might be a familiar name to you. Going through the Hydra Documentation, I came across two important operators + and ++. The documents mentions the use of these operators as follows: Appending a config value : +foo.bar=value Appending or overriding a config value : ++foo.bar=value I need some help understanding these operators, as using them in the code technically makes no difference in the overall …