Clearer code for PodGenerator.deserialize_model_file #26641
Merged
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Especially for how it handles non-existent file.
When the file path received doesn't exist, the current way is to use yaml.safe_load() to process it, and it returns the path as a string.
Then this string is passed to deserialize_model_dict() and results in an empty object. Passing 'None' to deserialize_model_dict() will do the same, but the code will become clearer, and less misleading.
Meanwhile, when the model file path received doesn't exist, there should be a warning in the log.
(This change shouldn't cause any behaviour change)
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