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"""Converts numbers to their Logarithm""" | |
import math | |
from h2oaicore.mojo_transformers import MjT_Replace | |
from h2oaicore.transformer_utils import CustomTransformer | |
from h2oaicore.systemutils import dtype_global | |
import datatable as dt | |
import numpy as np | |
class MyLogTransformer(CustomTransformer): | |
_testing_can_skip_failure = False # ensure tested as if shouldn't fail | |
@staticmethod | |
def get_default_properties(): | |
return dict(col_type="numeric", min_cols=1, max_cols=3, relative_importance=1) | |
def fit_transform(self, X: dt.Frame, y: np.array = None): | |
return self.transform(X) | |
def transform(self, X: dt.Frame): | |
if dtype_global() == np.float32: | |
X = X[:, [dt.float32(dt.log(dt.f[i])) for i in range(X.ncols)]] | |
else: | |
X = X[:, [dt.float64(dt.log(dt.f[i])) for i in range(X.ncols)]] | |
# Don't leave inf/-inf | |
for i in range(X.ncols): | |
X.replace([math.inf, -math.inf], None) | |
return X | |
# optional | |
_mojo = True | |
from h2oaicore.mojo import MojoWriter, MojoFrame | |
def to_mojo(self, mojo: MojoWriter, iframe: MojoFrame, group_uuid=None, group_name=None): | |
import uuid | |
group_uuid = str(uuid.uuid4()) | |
group_name = self.__class__.__name__ | |
from h2oaicore.mojo import MojoColumn, MojoFrame | |
from h2oaicore.mojo_transformers import MjT_Log | |
from h2oaicore.mojo_transformers_utils import AsType | |
xnew = iframe[self.input_feature_names] | |
oframe = MojoFrame() | |
for col in xnew: | |
ocol = MojoColumn(name=col.name, dtype=np.float64) | |
ocol_frame = MojoFrame(columns=[ocol]) | |
mojo += MjT_Log(iframe=MojoFrame(columns=[col]), oframe=ocol_frame, | |
group_uuid=group_uuid, group_name=group_name) | |
ocol_no_inf = ocol.duplicate() | |
mojo += MjT_Replace(iframe=MojoFrame(columns=[ocol]), | |
oframe=MojoFrame(columns=[ocol_no_inf]), | |
group_uuid=group_uuid, group_name=group_name, | |
map=[(np.inf, ocol_no_inf.pytype(np.nan))]) | |
ocol_no_neginf = ocol.duplicate() | |
mojo += MjT_Replace(iframe=MojoFrame(columns=[ocol]), | |
oframe=MojoFrame(columns=[ocol_no_neginf]), | |
group_uuid=group_uuid, group_name=group_name, | |
map=[(-np.inf, ocol_no_neginf.pytype(np.nan))]) | |
oframe += ocol | |
oframe = AsType(dtype_global()).write_to_mojo(mojo, oframe, | |
group_uuid=group_uuid, | |
group_name=group_name) | |
return oframe |