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|
"""
pint.facets.dask
~~~~~~~~~~~~~~~~
Adds pint the capability to interoperate with Dask
:copyright: 2022 by Pint Authors, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import annotations
import functools
from ...compat import compute, dask_array, persist, visualize
from ..plain import PlainRegistry
def check_dask_array(f):
@functools.wraps(f)
def wrapper(self, *args, **kwargs):
if isinstance(self._magnitude, dask_array.Array):
return f(self, *args, **kwargs)
else:
msg = "Method {} only implemented for objects of {}, not {}".format(
f.__name__, dask_array.Array, self._magnitude.__class__
)
raise AttributeError(msg)
return wrapper
class DaskQuantity:
# Dask.array.Array ducking
def __dask_graph__(self):
if isinstance(self._magnitude, dask_array.Array):
return self._magnitude.__dask_graph__()
else:
return None
def __dask_keys__(self):
return self._magnitude.__dask_keys__()
def __dask_tokenize__(self):
from dask.base import tokenize
from pint import UnitRegistry
# TODO: Check if this is the right class as first argument
return (UnitRegistry.Quantity, tokenize(self._magnitude), self.units)
@property
def __dask_optimize__(self):
return dask_array.Array.__dask_optimize__
@property
def __dask_scheduler__(self):
return dask_array.Array.__dask_scheduler__
def __dask_postcompute__(self):
func, args = self._magnitude.__dask_postcompute__()
return self._dask_finalize, (func, args, self.units)
def __dask_postpersist__(self):
func, args = self._magnitude.__dask_postpersist__()
return self._dask_finalize, (func, args, self.units)
@staticmethod
def _dask_finalize(results, func, args, units):
values = func(results, *args)
from pint import Quantity
# TODO: Check if this is the right class as first argument
return Quantity(values, units)
@check_dask_array
def compute(self, **kwargs):
"""Compute the Dask array wrapped by pint.PlainQuantity.
Parameters
----------
**kwargs : dict
Any keyword arguments to pass to ``dask.compute``.
Returns
-------
pint.PlainQuantity
A pint.PlainQuantity wrapped numpy array.
"""
(result,) = compute(self, **kwargs)
return result
@check_dask_array
def persist(self, **kwargs):
"""Persist the Dask Array wrapped by pint.PlainQuantity.
Parameters
----------
**kwargs : dict
Any keyword arguments to pass to ``dask.persist``.
Returns
-------
pint.PlainQuantity
A pint.PlainQuantity wrapped Dask array.
"""
(result,) = persist(self, **kwargs)
return result
@check_dask_array
def visualize(self, **kwargs):
"""Produce a visual representation of the Dask graph.
The graphviz library is required.
Parameters
----------
**kwargs : dict
Any keyword arguments to pass to ``dask.visualize``.
Returns
-------
"""
visualize(self, **kwargs)
class DaskRegistry(PlainRegistry):
_quantity_class = DaskQuantity
|
