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c83ec3555d
Summary: LLFF (and most/all non-synth datasets) will have no background/foreground distinction. Add support for data with no fg mask. Also, we had a bug in stats loading, like this: * Load stats * One of the stats has a history of length 0 * That's fine, e.g. maybe it's fg_error but the dataset has no notion of fg/bg. So leave it as len 0 * Check whether all the stats have the same history length as an arbitrarily chosen "reference-stat" * Ooops the reference-stat happened to be the stat with length 0 * assert (legit_stat_len == reference_stat_len (=0)) ---> failed assert Also some minor fixes (from Jeremy's other diff) to support LLFF Reviewed By: davnov134 Differential Revision: D38475272 fbshipit-source-id: 5b35ac86d1d5239759f537621f41a3aa4eb3bd68