[gpuCI] Forward-merge branch-21.12 to branch-22.02 [skip gpuci] #9680
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Closes #6255, #8416 This PR implements two related features: 1. Grouping by a frequency via the `freq=` argument to `cudf.Grouper` 2. and time-series resampling via the `.resample()` API Either operation results in ` _Resampler` object that represents the data resampled into "bins" of a particular frequency. The following operations are supported on resampled data: 1. Aggregations such as `min()` and `max()`, performed bin-wise 2. `ffill()` and `bfill()` methods: forward and backward filling in the case of upsampling data 3. `asfreq()`: returns the resampled data as a Series or DataFrame() These are all best understood by example: First, we create a time series with 1 minute intervals: ```python >>> index = cudf.date_range(start="2001-01-01", periods=10, freq="1T") >>> sr = cudf.Series(range(10), index=index) >>> sr 2001-01-01 00:00:00 0 2001-01-01 00:01:00 1 2001-01-01 00:02:00 2 2001-01-01 00:03:00 3 2001-01-01 00:04:00 4 2001-01-01 00:05:00 5 2001-01-01 00:06:00 6 2001-01-01 00:07:00 7 2001-01-01 00:08:00 8 2001-01-01 00:09:00 9 dtype: int64 ```` Downsampling to 3 minute intervals, followed by a "sum" aggregation: ```python >>> sr.resample("3T").sum() # equivalently, sr.groupby(cudf.Grouper(freq="3T")).sum() 2001-01-01 00:00:00 3 2001-01-01 00:03:00 12 2001-01-01 00:06:00 21 2001-01-01 00:09:00 9 dtype: int64 ```` Upsampling to 30 second intervals: ```python >>> sr.resample("30s").asfreq() 2001-01-01 00:00:00 0.0 2001-01-01 00:00:30 NaN 2001-01-01 00:01:00 1.0 2001-01-01 00:01:30 NaN 2001-01-01 00:02:00 2.0 2001-01-01 00:02:30 NaN 2001-01-01 00:03:00 3.0 2001-01-01 00:03:30 NaN 2001-01-01 00:04:00 4.0 2001-01-01 00:04:30 NaN 2001-01-01 00:05:00 5.0 2001-01-01 00:05:30 NaN 2001-01-01 00:06:00 6.0 2001-01-01 00:06:30 NaN 2001-01-01 00:07:00 7.0 2001-01-01 00:07:30 NaN 2001-01-01 00:08:00 8.0 2001-01-01 00:08:30 NaN 2001-01-01 00:09:00 9.0 Freq: 30S, dtype: float64 ``` Upsampling to 30 second intervals, followed by a forward fill: ```python >>> sr.resample("30s").ffill() 2001-01-01 00:00:00 0 2001-01-01 00:00:30 0 2001-01-01 00:01:00 1 2001-01-01 00:01:30 1 2001-01-01 00:02:00 2 2001-01-01 00:02:30 2 2001-01-01 00:03:00 3 2001-01-01 00:03:30 3 2001-01-01 00:04:00 4 2001-01-01 00:04:30 4 2001-01-01 00:05:00 5 2001-01-01 00:05:30 5 2001-01-01 00:06:00 6 2001-01-01 00:06:30 6 2001-01-01 00:07:00 7 2001-01-01 00:07:30 7 2001-01-01 00:08:00 8 2001-01-01 00:08:30 8 2001-01-01 00:09:00 9 Freq: 30S, dtype: int64 ``` Authors: - Ashwin Srinath (https://github.com/shwina) - Michael Wang (https://github.com/isVoid) Approvers: - https://github.com/brandon-b-miller - Vyas Ramasubramani (https://github.com/vyasr) - Benjamin Zaitlen (https://github.com/quasiben) URL: #9178
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SUCCESS - forward-merge complete. |
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Forward-merge triggered by push to
branch-21.12that creates a PR to keepbranch-22.02up-to-date. If this PR is unable to be immediately merged due to conflicts, it will remain open for the team to manually merge.