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* adds processor for `df.get(xxx)` notation * adds streaming data * logit models are maskable (only a subset of rows are evaluated) * when converting dataframe to dataset, duplicate column names are generally not allowed, but if column data is identical then the duplicate column is dropped (this compatibility comes at a cost of some performance and should be avoided if possible) * code now emits `CacheMissWarning` when compile is triggered, this is totally normal and expected on the first pass to compile things, but can give useful information when a function is unexpectedly recompiled (e.g. due to an accidental difference in input dtypes) * intermediate functions are no longer cached, reducing the cache footprint on disk with no impact on performance * ast processing now completes a first pass on each expression with each subspace before cascading down to fallback subspaces, this permits more complex expressions to complete * implements nested logit, `mnl_draws` function name changed to `logit_draw`. * no longer tested for compatibility with Python 3.7 (google colab updated to 3.8)
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