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add robust zscore processor & ALPHA360 support custom processors

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This commit is contained in:
Dong Zhou
2020-11-26 12:04:48 +08:00
parent 21eb86e5cb
commit d0ca52f3fd
2 changed files with 86 additions and 36 deletions
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84
qlib/contrib/data/handler.py
View File

@@ -10,6 +10,28 @@ from inspect import getfullargspec
import copy
def check_transform_proc(proc_l, fit_start_time, fit_end_time):
new_l = []
for p in proc_l:
if not isinstance(p, Processor):
klass, pkwargs = get_cls_kwargs(p, processor_module)
args = getfullargspec(klass).args
if "fit_start_time" in args and "fit_end_time" in args:
assert (
fit_start_time is not None and fit_end_time is not None
), "Make sure `fit_start_time` and `fit_end_time` are not None."
pkwargs.update(
{
"fit_start_time": fit_start_time,
"fit_end_time": fit_end_time,
}
)
new_l.append({"class": klass.__name__, "kwargs": pkwargs})
else:
new_l.append(p)
return new_l
class ALPHA360_Denoise(DataHandlerLP):
def __init__(self, instruments="csi500", start_time=None, end_time=None, fit_start_time=None, fit_end_time=None):
data_loader = {
@@ -83,8 +105,31 @@ class ALPHA360_Denoise(DataHandlerLP):
return fields, names
_DEFAULT_LEARN_PROCESSORS = [
{"class": "DropnaLabel"},
{"class": "CSZScoreNorm", "kwargs": {"fields_group": "label"}},
]
_DEFAULT_INFER_PROCESSORS = [
{"class": "ProcessInf", "kwargs": {}},
{"class": "ZScoreNorm", "kwargs": {}},
{"class": "Fillna", "kwargs": {}},
]
class ALPHA360(DataHandlerLP):
def __init__(self, instruments="csi500", start_time=None, end_time=None, fit_start_time=None, fit_end_time=None):
def __init__(
self,
instruments="csi500",
start_time=None,
end_time=None,
infer_processors=_DEFAULT_INFER_PROCESSORS,
learn_processors=_DEFAULT_LEARN_PROCESSORS,
fit_start_time=None,
fit_end_time=None,
):
infer_processors = check_transform_proc(infer_processors, fit_start_time, fit_end_time)
learn_processors = check_transform_proc(learn_processors, fit_start_time, fit_end_time)
data_loader = {
"class": "QlibDataLoader",
"kwargs": {
@@ -95,16 +140,6 @@ class ALPHA360(DataHandlerLP):
},
}
learn_processors = [
{"class": "DropnaLabel", "kwargs": {"fields_group": "label"}},
{"class": "CSZScoreNorm", "kwargs": {"fields_group": "label"}},
]
infer_processors = [
{"class": "ProcessInf", "kwargs": {}},
{"class": "ZscoreNorm", "kwargs": {"fit_start_time": fit_start_time, "fit_end_time": fit_end_time}},
{"class": "Fillna", "kwargs": {}},
]
super().__init__(
instruments,
start_time,
@@ -168,33 +203,12 @@ class Alpha158(DataHandlerLP):
start_time=None,
end_time=None,
infer_processors=[],
learn_processors=["DropnaLabel", {"class": "CSZScoreNorm", "kwargs": {"fields_group": "label"}}],
learn_processors=_DEFAULT_LEARN_PROCESSORS,
fit_start_time=None,
fit_end_time=None,
):
def check_transform_proc(proc_l):
new_l = []
for p in proc_l:
if not isinstance(p, Processor):
klass, pkwargs = get_cls_kwargs(p, processor_module)
args = getfullargspec(klass).args
if "fit_start_time" in args and "fit_end_time" in args:
assert (
fit_start_time is not None and fit_end_time is not None
), "Make sure `fit_start_time` and `fit_end_time` are not None."
pkwargs.update(
{
"fit_start_time": fit_start_time,
"fit_end_time": fit_end_time,
}
)
new_l.append({"class": klass.__name__, "kwargs": pkwargs})
else:
new_l.append(p)
return new_l
infer_processors = check_transform_proc(infer_processors)
learn_processors = check_transform_proc(learn_processors)
infer_processors = check_transform_proc(infer_processors, fit_start_time, fit_end_time)
learn_processors = check_transform_proc(learn_processors, fit_start_time, fit_end_time)
data_loader = {
"class": "QlibDataLoader",

38
qlib/data/dataset/processor.py
View File

@@ -166,7 +166,9 @@ class MinMaxNorm(Processor):
return df
class ZscoreNorm(Processor):
class ZScoreNorm(Processor):
"""ZScore Normalization"""
def __init__(self, fit_start_time, fit_end_time, fields_group=None):
self.fit_start_time = fit_start_time
self.fit_end_time = fit_end_time
@@ -193,6 +195,40 @@ class ZscoreNorm(Processor):
return df
class RobustZScoreNorm(Processor):
"""Robust ZScore Normalization
Use robust statistics for Z-Score normalization:
mean(x) = median(x)
std(x) = MAD(x) * 1.4826
Reference:
https://en.wikipedia.org/wiki/Median_absolute_deviation.
"""
def __init__(self, fit_start_time, fit_end_time, fields_group=None, clip_outlier=True):
self.fit_start_time = fit_start_time
self.fit_end_time = fit_end_time
self.fields_group = fields_group
self.clip_outlier = clip_outlier
def fit(self, df):
df = fetch_df_by_index(df, slice(self.fit_start_time, self.fit_end_time), level="datetime")
self.cols = get_group_columns(df, self.fields_group)
X = df[self.cols].values
self.mean_train = np.nanmedian(X, axis=0)
self.std_train = np.nanmedian(np.abs(X - self.mean_train), axis=0)
self.std_train += EPS
self.std_train *= 1.4826
def __call__(self, df):
df.loc(axis=1)[self.cols] -= self.mean_train
df.loc(axis=1)[self.cols] /= self.std_train
if self.clip_outlier:
df.clip(-3, 3, inplace=True)
return df
class CSZScoreNorm(Processor):
"""Cross Sectional ZScore Normalization"""