... GPI Data Pipeline 1.0 documentation . GPI Data Pipeline Developer?s Guide . Enter search terms or a module, class or function name. Utility Functions . ... The pipeline provides and makes use of a wide variety of utility functions for common tasks. ... Utility function for expanding pathnames, ~ and ~username, environment variables, etc. gpi_shorten_path . ... Read in image extension data and primary and extension headers in one convenient function call. gpi_load_and_preprocess_fits . ...