CHANGELOG.md

Changelog

0.5.2.1

• Fixes pickling error when using PySpark.

0.5.2

• added new methods onto TDigest object:
  • to_dict(): return a Python dictionary of the TDigest and internal Centroid values.
  • update_from_dict(dict_values): update from serialized dictionary values into the TDigest object.
  • centroids_to_list(): return a Python list of the TDigest object's internal Centroid values.
  • update_centroids_from_list(list_values): update Centroids from a python list.

0.5.0

• updated to use new accumulation_tree library. This replacement means much better performance in updating the TDigest.
• TDigest is Python3 only going forward.
• Fixed issues with percentile function
• quantile has be renamed to the more correct name cdf

0.4.1.0

• fixed a bug in trimmed_mean that was giving incorrect results. Proper interpolation and tests correct this.

0.4.0.2

• new dependency updates.
• fix quantile with only one centroid.

0.3.0

• The definition of percentile was used incorrectly in tdigest. Previous to 0.3.0, a percentile was defined between 0 and 1. In fact, a percentile is defined between 0 and 100 (hence the 'percent' in percentile). This follows other conventions, like in Numpy and Scipy. This affects the TDigest.percentile function.

0.2.0

• Make the tdigest library Python3 compatible.

0.1.2

• the TDigest was not handling ints very well. For example, given [1,2,2,2,2,2,3], it would return that the percentile was 3. With the fix, it is possible that a centroid can exceed its size threshold.
• batch_update function now has a kwarg to specify the weight of all elements in the inputted array.