I am getting warnings like these when running numpy on reasonably large pipeline.

RuntimeWarning: invalid value encountered in true_divide

RuntimeWarning: invalid value encountered in greater

How do I find where they are occurring in the code besides writing dozens of print statements?

Python 2.7 and numpy 1.8.1

One way is to convert the warnings to errors:

import warnings
warnings.simplefilter('error', RuntimeWarning)

Then the traceback will tell you where the error occurred.

Thanks to @Graham501617 for the following tip:

This can be done without code changes using the python cli:

python -Werror my_script.py

See the Python documentation for more information.