def fit_transform(self, input_df: XDataFrame) -> XDataFrame:
"""Fit to data frame, then transform it.
Args:
input_df (XDataFrame): Input data frame.
Returns:
XDataFrame : Output data frame.
"""
if cudf_is_available() and isinstance(input_df, cudf.DataFrame):
self._selected_cols = (
input_df.to_pandas()
.T.drop_duplicates(keep="first")
.index.values.tolist()
)
else:
self._selected_cols = input_df.T.drop_duplicates(
keep="first"
).index.values.tolist()
return input_df[self._selected_cols]
def transform(self, input_df: XDataFrame) -> XDataFrame:
"""Transform data frame.
Args:
input_df (XDataFrame): Input data frame.
Returns:
XDataFrame : Output data frame.
"""
if isinstance(input_df, pd.DataFrame):
new_df = input_df.copy()
elif cudf_is_available() and isinstance(input_df, cudf.DataFrame):
new_df = input_df.to_pandas()
else:
raise RuntimeError("Unexpected data type: {}".format(type(input_df)))
generated_cols = []
input_cols = self._input_cols
if not input_cols:
input_cols = new_df.columns.tolist()
if len(self._exclude_cols) > 0:
input_cols = [col for col in input_cols if col not in self._exclude_cols]
for col in input_cols:
new_col = self._output_prefix + col + self._output_suffix
if self._fillna is not None:
new_df[new_col] = (
new_df[col].fillna(self._fillna).apply(self._lambda_func)
)
else:
new_df[new_col] = new_df[col].apply(self._lambda_func)
generated_cols.append(new_col)
if cudf_is_available() and isinstance(input_df, cudf.DataFrame):
new_df = cudf.from_pandas(new_df)
if self._drop_origin:
return new_df[generated_cols]
return new_df
def reduce_mem_usage(df: XDataFrame,
verbose: bool = True,
debug: bool = True) -> XDataFrame:
start_mem = df.memory_usage().sum() / 1024**2
if is_cudf(df):
df = compress_df(df.to_pandas())
else:
df = compress_df(df)
end_mem = df.memory_usage().sum() / 1024**2
reduction = (start_mem - end_mem) / start_mem
msg = (f"Mem. usage decreased to {end_mem:5.2f} MB" +
f" ({reduction * 100:.1f} % reduction)")
if verbose:
print(msg)
if debug:
logging.debug(msg)
return df
def fit(self, input_df: XDataFrame) -> None:
"""Fit to data frame
Args:
input_df (XDataFrame): Input data frame.
Returns:
XDataFrame : Output data frame.
"""
org_cols = input_df.columns.tolist()
input_df = (input_df.to_pandas()
if isinstance(input_df, cudf.DataFrame) else input_df)
seen_cols_pairs = (load_pickle(self.save_path /
"seen_feats_pairs.pkl") if
(self.save_path / "seen_feats_pairs.pkl").exists()
else defaultdict(list))
removed_cols_pairs = (load_pickle(self.save_path /
"removed_feats_pairs.pkl") if
(self.save_path /
"removed_feats_pairs.pkl").exists() else
defaultdict(list))
removed_cols = sum(removed_cols_pairs.values(), [])
if self.dry_run:
self._selected_cols = [
col for col in org_cols if col not in set(removed_cols)
]
return
org_cols = [col for col in org_cols if col not in removed_cols]
counter = 0
for i in tqdm(range(len(org_cols) - 1)):
feat_a_name = org_cols[i]
if feat_a_name in removed_cols:
continue
feat_a = input_df[feat_a_name]
for j in range(i + 1, len(org_cols)):
feat_b_name = org_cols[j]
if self._has_seen(feat_a_name, feat_b_name, seen_cols_pairs):
continue
else:
seen_cols_pairs[feat_a_name].append(feat_b_name)
seen_cols_pairs[feat_b_name].append(feat_a_name)
if self._has_removed(feat_a_name, feat_b_name, removed_cols):
continue
feat_b = input_df[feat_b_name]
c = np.corrcoef(feat_a, feat_b)[0][1]
if abs(c) > self._threshold:
counter += 1
removed_cols.append(feat_b_name)
removed_cols_pairs[feat_a_name].append(feat_b_name)
print("{}: FEAT_A: {} FEAT_B: {} - Correlation: {}".format(
counter, feat_a_name, feat_b_name, c))
save_pickle(removed_cols_pairs,
self.save_path / "removed_feats_pairs.pkl")
save_pickle(seen_cols_pairs, self.save_path / "seen_feats_pairs.pkl")
self._selected_cols = [
col for col in org_cols if col not in set(removed_cols)
]
