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import cudf
import pandas as pd
import dask.dataframe as dd
import dask_cudf
from .utils import as_timedelta
from typing import Literal, List
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from typeguard import typechecked
__all__ = ['get_aggregator']
# ENH: In the future, probably need to wrap the manager and backend type into a class. That class would contain the
# read_parquet function instead of putting it in the aggregation classes. This would separate everything out more
# sensibly
@typechecked
class Aggregator:
def __init__(self):
self.backend = None
self.cuda = None
def _cut(
self,
ser: pd.Series | cudf.Series,
bins: List[int | pd.Timestamp],
labels: List[str] | None = None,
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**kwargs
) -> pd.Series | cudf.Series:
right = kwargs.pop('right',False)
if self.cuda:
func = cudf.cut
ser = ser.astype('int64')
else:
func = pd.cut
grps = func(ser,bins=bins,labels=labels,right=right,**kwargs)
if labels is not None:
grps = grps.cat.reorder_categories(labels[::-1], ordered = True)
return grps
def create_timedelta_cutoffs(
self,
delta_vals: int | List[int],
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delta_unit: Literal['D','W','M','Y'],
run_date: pd.Timestamp
) -> List[int | pd.Timestamp]:
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deltas = pd.Series([as_timedelta(c,delta_unit) for c in delta_vals])
cutoffs = pd.to_datetime(run_date - deltas)
cutoffs = (
pd.concat(
[
cutoffs,
pd.Series([pd.to_datetime('today'),pd.to_datetime('1970-01-01')])
]
)
.sort_values()
)
return cutoffs.astype('int64').to_list() if self.cuda else cutoffs.to_list()
def create_timedelta_labels(
self,
delta_vals: List[int],
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delta_unit: Literal['D','W','M','Y'],
) -> List[str]:
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delta_vals.sort(reverse=True)
deltas = [f'{d}{delta_unit}' for d in delta_vals]
labels = [f'>{deltas[0]}'] + [f'{deltas[i+1]}-{deltas[i]}' for i in range(len(deltas)-1)] + [f'<{deltas[-1]}']
return labels
class PandasAggregator(Aggregator):
def __init__(self):
self.backend = 'pandas'
self.cuda = False
def read_parquet(self,dataset_path,**kwargs) -> pd.DataFrame:
return pd.read_parquet(dataset_path,**kwargs)
def cut_dt(self,series,*args,**kwargs) -> pd.Series:
return self._cut(series,*args,**kwargs)
def aggregate(
self,
df: cudf.DataFrame,
col: str | List[str],
grps: str | List[str],
funcs: str | List[str]
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) -> pd.DataFrame:
df_agg = (
df.groupby(grps,observed = True)[col]
.agg(funcs)
.sort_index(level=[0,1])
.reset_index()
)
return df_agg
class CUDFAggregator(Aggregator):
def __init__(self):
self.backend = 'cudf'
self.cuda = True
def read_parquet(self,dataset_path,**kwargs) -> cudf.DataFrame:
return cudf.read_parquet(dataset_path,**kwargs)
def cut_dt(self,series,*args,**kwargs) -> pd.Series:
return self._cut(series,*args,**kwargs)
def aggregate(
self,
df: cudf.DataFrame,
col: str | List[str],
grps: str | List[str],
funcs: str | List[str]
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) -> pd.DataFrame:
df_agg = (
df.groupby(grps,observed = True)[col]
.agg(funcs)
.sort_index(level=[0,1])
.to_pandas()
.reset_index()
)
return df_agg
class DaskAggregator(Aggregator):
def __init__(self):
self.backend = 'dask'
self.cuda = False
def cut_dt(self,series,*args,**kwargs) -> cudf.Series:
return series.map_partitions(self._cut,*args,**kwargs)
def aggregate(
self,
df: dd.DataFrame,
col: str | List[str],
grps: str | List[str],
funcs: str | List[str]
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) -> pd.DataFrame:
df_agg = (
df.groupby(grps,observed = True)[col]
.agg(funcs)
.compute()
.sort_index(level=[0,1])
.reset_index()
)
return df_agg
def read_parquet(self,dataset_path,**kwargs) -> dd.DataFrame:
split_row_groups = kwargs.pop('split_row_groups',False)
return dd.read_parquet(dataset_path,split_row_groups=split_row_groups,**kwargs)
class DaskCUDFAggregator(Aggregator):
def __init__(self):
self.backend = 'dask_cuda'
self.cuda = True
def cut_dt(self,series,*args,**kwargs) -> dask_cudf.Series:
return series.map_partitions(self._cut,*args,**kwargs)
def aggregate(
self,
df: dask_cudf.DataFrame,
col: str | List[str],
grps: str | List[str],
funcs: str | List[str]
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) -> pd.DataFrame:
df_agg = (
df.groupby(grps,observed = True)[col]
.agg(funcs)
.compute()
.sort_index(level=[0,1])
.to_pandas()
.reset_index()
)
return df_agg
def read_parquet(self,dataset_path,**kwargs) -> dd.DataFrame:
split_row_groups = kwargs.pop('split_row_groups',False)
return dd.read_parquet(dataset_path,split_row_groups=split_row_groups,**kwargs)
def get_aggregator(backend) -> PandasAggregator | CUDFAggregator | DaskAggregator | DaskCUDFAggregator:
match backend:
case 'pandas':
return PandasAggregator()
case 'cudf':
return CUDFAggregator()
case 'dask':
return DaskAggregator()
case 'dask_cuda':
return DaskCUDFAggregator()
case _:
raise ValueError(f"Unsupported backend: {backend}")