def test_fit(self):
# training data
d = {
"col1": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10.0],
"col2": [21, 22, 23, 24, 25, 26, 27, 28, 29, 30.0],
}
df = pd.DataFrame(data=d)
scale = PreprocessingScale(["col1"])
scale.fit(df)
df = scale.transform(df)
assert_almost_equal(np.mean(df["col1"]), 0)
assert_almost_equal(np.mean(df["col2"]), 25.5)
def test_to_and_from_json(self):
# training data
d = {
"col1": [1, 2, 3, 4, 5, 6, 7, 8.0, 9, 10],
"col2": [21, 22.0, 23, 24, 25, 26, 27, 28, 29, 30],
}
df = pd.DataFrame(data=d)
scale = PreprocessingScale(["col1"])
scale.fit(df)
# do not transform
assert_almost_equal(np.mean(df["col1"]), 5.5)
assert_almost_equal(np.mean(df["col2"]), 25.5)
# to and from json
json_data = scale.to_json()
print(json_data)
scale2 = PreprocessingScale()
scale2.from_json(json_data)
# transform with loaded scaler
df = scale2.transform(df)
assert_almost_equal(np.mean(df["col1"]), 0)
assert_almost_equal(np.mean(df["col2"]), 25.5)
def run(self, train_data=None, validation_data=None):
log.debug("PreprocessingStep.run")
X_train, y_train = None, None
if train_data is not None:
if "X" in train_data:
X_train = train_data.get("X").copy()
if "y" in train_data:
y_train = train_data.get("y").copy()
X_validation, y_validation = None, None
if validation_data is not None:
if "X" in validation_data:
X_validation = validation_data.get("X").copy()
if "y" in validation_data:
y_validation = validation_data.get("y").copy()
if y_train is not None:
# target preprocessing
# this must be used first, maybe we will drop some rows because of missing target values
target_preprocessing = self._params.get("target_preprocessing")
log.debug(
"target_preprocessing -> {}".format(target_preprocessing))
# if PreprocessingMissingValues.NA_EXCLUDE in target_preprocessing:
X_train, y_train = PreprocessingExcludeMissingValues.transform(
X_train, y_train)
if validation_data is not None:
X_validation, y_validation = PreprocessingExcludeMissingValues.transform(
X_validation, y_validation)
if PreprocessingCategorical.CONVERT_INTEGER in target_preprocessing:
self._categorical_y = LabelEncoder()
self._categorical_y.fit(y_train)
y_train = pd.Series(self._categorical_y.transform(y_train))
if y_validation is not None and self._categorical_y is not None:
y_validation = pd.Series(
self._categorical_y.transform(y_validation))
if PreprocessingScale.SCALE_LOG_AND_NORMAL in target_preprocessing:
log.error("not implemented SCALE_LOG_AND_NORMAL")
raise Exception("not implemented SCALE_LOG_AND_NORMAL")
if PreprocessingScale.SCALE_NORMAL in target_preprocessing:
log.error("not implemented SCALE_NORMAL")
raise Exception("not implemented SCALE_NORMAL")
# columns preprocessing
columns_preprocessing = self._params.get("columns_preprocessing")
for column in columns_preprocessing:
transforms = columns_preprocessing[column]
log.debug("Preprocess column -> {}, {}".format(column, transforms))
# remove empty or constant columns
cols_to_remove = list(
filter(
lambda k: "remove_column" in columns_preprocessing[k],
columns_preprocessing,
))
if X_train is not None:
X_train.drop(cols_to_remove, axis=1, inplace=True)
if X_validation is not None:
X_validation.drop(cols_to_remove, axis=1, inplace=True)
self._remove_columns = cols_to_remove
for missing_method in [PreprocessingMissingValues.FILL_NA_MEDIAN]:
cols_to_process = list(
filter(
lambda k: missing_method in columns_preprocessing[k],
columns_preprocessing,
))
missing = PreprocessingMissingValues(cols_to_process,
missing_method)
missing.fit(X_train)
X_train = missing.transform(X_train)
if X_validation is not None:
X_validation = missing.transform(X_validation)
self._missing_values += [missing]
for convert_method in [PreprocessingCategorical.CONVERT_INTEGER]:
cols_to_process = list(
filter(
lambda k: convert_method in columns_preprocessing[k],
columns_preprocessing,
))
convert = PreprocessingCategorical(cols_to_process, convert_method)
convert.fit(X_train)
X_train = convert.transform(X_train)
if X_validation is not None:
X_validation = convert.transform(X_validation)
self._categorical += [convert]
# SCALE
for scale_method in [PreprocessingScale.SCALE_NORMAL]:
cols_to_process = list(
filter(
lambda k: scale_method in columns_preprocessing[k],
columns_preprocessing,
))
if len(cols_to_process):
scale = PreprocessingScale(cols_to_process)
scale.fit(X_train)
X_train = scale.transform(X_train)
if X_validation is not None:
X_validation = scale.transform(X_validation)
self._scale += [scale]
return {
"X": X_train,
"y": y_train
}, {
"X": X_validation,
"y": y_validation
}