def test_error_if_input_df_contains_categories_not_present_in_training_df(
df_enc, df_enc_rare):
# test case 4: when dataset to be transformed contains categories not present
# in training dataset
msg = "During the encoding, NaN values were introduced in the feature(s) var_A."
# check for warning when rare_labels equals 'ignore'
with pytest.warns(UserWarning) as record:
encoder = OrdinalEncoder(errors="ignore")
encoder.fit(df_enc[["var_A", "var_B"]], df_enc["target"])
encoder.transform(df_enc_rare[["var_A", "var_B"]])
# check that only one warning was raised
assert len(record) == 1
# check that the message matches
assert record[0].message.args[0] == msg
# check for error when rare_labels equals 'raise'
with pytest.raises(ValueError) as record:
encoder = OrdinalEncoder(errors="raise")
encoder.fit(df_enc[["var_A", "var_B"]], df_enc["target"])
encoder.transform(df_enc_rare[["var_A", "var_B"]])
# check that the error message matches
assert str(record.value) == msg
def test_error_if_input_df_contains_categories_not_present_in_training_df(
df_enc, df_enc_rare):
# test case 4: when dataset to be transformed contains categories not present
# in training dataset
with pytest.warns(UserWarning):
encoder = OrdinalEncoder(encoding_method="arbitrary")
encoder.fit(df_enc)
encoder.transform(df_enc_rare)
def feature_engineering_ordinal_encoding(X_train, y_train, X_test):
encoder = OrdinalEncoder(
encoding_method='ordered',
variables=[
'gender',
# 'hypertension',
#'heart_disease',
'ever_married',
'work_type',
'Residence_type',
'smoking_status'
])
encoder.fit(X_train, y_train)
train_t = encoder.transform(X_train)
test_t = encoder.transform(X_test)
return train_t, test_t
def test_variables_cast_as_category(df_enc_category_dtypes):
df = df_enc_category_dtypes.copy()
encoder = OrdinalEncoder(encoding_method="ordered", variables=["var_A"])
encoder.fit(df[["var_A", "var_B"]], df["target"])
X = encoder.transform(df[["var_A", "var_B"]])
# expected output
transf_df = df.copy()
transf_df["var_A"] = [
1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2
]
# test transform output
pd.testing.assert_frame_equal(X,
transf_df[["var_A", "var_B"]],
check_dtype=False)
assert X["var_A"].dtypes == int
def test_ordered_encoding_1_variable(df_enc):
# test case 1: 1 variable, ordered encoding
encoder = OrdinalEncoder(encoding_method="ordered", variables=["var_A"])
encoder.fit(df_enc[["var_A", "var_B"]], df_enc["target"])
X = encoder.transform(df_enc[["var_A", "var_B"]])
# expected output
transf_df = df_enc.copy()
transf_df["var_A"] = [
1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2
]
# test init params
assert encoder.encoding_method == "ordered"
assert encoder.variables == ["var_A"]
# test fit attr
assert encoder.encoder_dict_ == {"var_A": {"A": 1, "B": 0, "C": 2}}
assert encoder.input_shape_ == (20, 2)
# test transform output
pd.testing.assert_frame_equal(X, transf_df[["var_A", "var_B"]])
def test_ordered_encoding_1_variable_ignore_format(df_enc_numeric):
encoder = OrdinalEncoder(encoding_method="ordered",
variables=["var_A"],
ignore_format=True)
encoder.fit(df_enc_numeric[["var_A", "var_B"]], df_enc_numeric["target"])
X = encoder.transform(df_enc_numeric[["var_A", "var_B"]])
# expected output
transf_df = df_enc_numeric.copy()
transf_df["var_A"] = [
1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2
]
# test init params
assert encoder.encoding_method == "ordered"
assert encoder.variables == ["var_A"]
# test fit attr
assert encoder.variables_ == ["var_A"]
assert encoder.encoder_dict_ == {"var_A": {1: 1, 2: 0, 3: 2}}
assert encoder.n_features_in_ == 2
# test transform output
pd.testing.assert_frame_equal(X, transf_df[["var_A", "var_B"]])
# Regularize data set
df.price_per_size = df.price_per_size / 10000
df.price = df.price / 1000000
df.rent = df.rent / 1000
# Test train split
X = df.drop(columns=['price'], axis=1)
Y = df['price']
X_train, X_test, y_train, y_test = train_test_split(X, Y, test_size=0.33)
# Encoding the regions
regions_df = np.asarray(X['region']).reshape(1, -1)
enc = OrdinalEncoder(encoding_method='ordered', variables=['region'])
enc.fit(X_train, y_train)
X_train_enc = enc.transform(X_train)
X_test_enc = enc.transform(X_test)
# fit model no training data
regressor = xgboost.XGBRegressor(n_estimators=100,
reg_lambda=1,
gamma=0,
max_depth=3)
regressor.fit(X_train_enc, y_train)
# make predictions for test data
y_pred = regressor.predict(X_test_enc)
predictions = [round(value) for value in y_pred]
# evaluate predictions
mse = mean_squared_error(y_test, predictions)
def test_transform_raises_error_if_df_contains_na(df_enc, df_enc_na):
# test case 4: when dataset contains na, transform method
with pytest.raises(ValueError):
encoder = OrdinalEncoder(encoding_method="arbitrary")
encoder.fit(df_enc)
encoder.transform(df_enc_na)
def test_non_fitted_error(df_enc):
with pytest.raises(NotFittedError):
imputer = OrdinalEncoder()
imputer.transform(df_enc)
