Minor Description
In MLlib PySpark, we sometimes test the type of an object and print an error if the object is of the wrong type. E.g.:
https://github.com/apache/spark/blob/f084c5de14eb10a6aba82a39e03e7877926ebb9e/python/pyspark/mllib/regression.py#L173
These checks should print the type, not the actual object. E.g., if the object cannot be converted to a string, then the check linked above will give a warning like this:
TypeError: not all arguments converted during string formatting
...which is weird for the user.
There may be other places in the codebase where this is an issue, so we need to check through and verify.
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