Schema for Statistics (statistics.json file) - Amazon SageMaker

Schema for Statistics (statistics.json file)

Amazon SageMaker Model Monitor pre-built container computes per column/feature statistics. The statistics are calculated for the baseline dataset and also for the current dataset that is being analyzed.

{ "version": 0, # dataset level stats "dataset": { "item_count": number }, # feature level stats "features": [ { "name": "feature-name", "inferred_type": "Fractional" | "Integral", "numerical_statistics": { "common": { "num_present": number, "num_missing": number }, "mean": number, "sum": number, "std_dev": number, "min": number, "max": number, "distribution": { "kll": { "buckets": [ { "lower_bound": number, "upper_bound": number, "count": number } ], "sketch": { "parameters": { "c": number, "k": number }, "data": [ [ num, num, num, num ], [ num, num ][ num, num ] ] }#sketch }#KLL }#distribution }#num_stats }, { "name": "feature-name", "inferred_type": "String", "string_statistics": { "common": { "num_present": number, "num_missing": number }, "distinct_count": number, "distribution": { "categorical": { "buckets": [ { "value": "string", "count": number } ] } } }, #provision for custom stats } ] }

Note the following:

  • The prebuilt containers compute KLL sketch which is a compact quantiles sketch.

  • By default, we materialize the distribution in 10 buckets. This is not currently configurable.