GPU and Dask support for classify module (#168)

* slope: float dtype

* classify: correct docs

* add dask support for reclassify

* remove nodata param

* add reclassify to __init__

* reclassify: add cupy gpu support

* reclassify: add tests

* reclassify: error messages in case dask cupy, update tests

* is_cupy_backed: catch exception

* reclassify: implemented dask and cupy backed case

* refactor

* refactor

* quantile: number of quantiles if not enough unique values

* reclassify: condense tests

* quantile: add gpu support

* quantile: refactor

* remove scipy.stats dependence

* quantile: dask numpy case

* quantile: dask numpy case

* quantile: error messages in case dask cupy

* quantile: correct condition check

* debugging

* debugging

* quantile: dask numpy case bug fixes

* quantile: dask numpy case bug fixes

* quantile: update tests

* equal_interval: numpy case

* equal_interval: cupy case

* equal_interval: dask numpy backed case

* equal_interval: error message if dask cupy case

* natural_break: numpy case

* natural break: cupy case

* classify: condense tests

* update readme

Author: thuydotm

README.md

@@ -70,10 +70,10 @@ In the GIS world, rasters are used for representing continuous phenomena (e.g. e
 
 | Name | NumPy xr.DataArray | Dask xr.DataArray | CuPy GPU xr.DataArray | Dask GPU xr.DataArray |
 |:----------:|:----------------------:|:--------------------:|:-------------------:|:------:|
-| [Equal Interval](xrspatial/classify.py) | ✅️ |  |  |  |
-| [Natural Breaks](xrspatial/classify.py) | ✅️ |  |  |  |
-| [Reclassify](xrspatial/classify.py) | ✅️ |  |  |  |
-| [Quantile](xrspatial/classify.py) | ✅️ |  |  |  |
+| [Equal Interval](xrspatial/classify.py) | ✅️ | ✅ | ✅ |  |
+| [Natural Breaks](xrspatial/classify.py) | ✅️ |  | ✅ |  |
+| [Reclassify](xrspatial/classify.py) | ✅️ | ✅ | ✅ | ✅ |
+| [Quantile](xrspatial/classify.py) | ✅️ | ✅ | ✅ |  |
 
 -------
 

xrspatial/__init__.py

@@ -35,6 +35,7 @@
 from xrspatial.zonal import crop # noqa
 
 from xrspatial.classify import quantile  # noqa
+from xrspatial.classify import reclassify  # noqa
 from xrspatial.classify import equal_interval  # noqa
 from xrspatial.classify import natural_breaks  # noqa