def test_categorical_indexer():
train_x = np.array([["a", 1, "python", 4.5], ["b", 2, "c++", 6.8],
["c", 10, "java", 4.8]])
valid_x = np.array([["a", 1, "scala", 4.5], ["c", 2, "c++", 6.8],
["d", 10, "python", 4.8]])
test_x = np.array([["a", 1, "scala", 4.5]])
dm = DataManager()
dm.feature_types = ["Categorical", "Discrete", "Categorical", "Float"]
dm.train_X = train_x
dm.val_X = valid_x
dm.test_X = test_x
dm = categorical_indexer(dm)
print(dm.feature_types)
print(dm.train_X)
print("----------------------------")
print(dm.val_X)
print("----------------------------")
print(dm.test_X)
def test_impute_dm():
train_x = np.array([["a", 1, "python", 4.5], ["b", 2, "c++", 6.8],
["c", 10, "java", 4.8]])
valid_x = np.array([["a", 1, "scala", 4.5], ["c", 2, "c++", 6.8],
["d", 10, "python", 4.8]])
test_x = np.array([["a", 1, "scala", 4.5]])
train_x[2][0] = "???"
train_x[2][2] = "???"
valid_x[0][1] = np.nan
test_x[0][-1] = np.nan
dm = DataManager()
dm.feature_types = ["Categorical", "Discrete", "Categorical", "Float"]
dm.train_X = train_x.astype(np.object)
dm.val_X = valid_x.astype(np.object)
dm.test_X = test_x.astype(np.object)
dm = impute_dm(dm, "???")
print(dm.feature_types)
print(dm.train_X)
print("----------------------------")
print(dm.val_X)
print("----------------------------")
print(dm.test_X)
def one_hot(dm: DataManager) -> DataManager:
"""
Convert the categorical features to float with one-hot encoding
:param dm:
:return:
"""
feature_types = dm.feature_types
categorical_index = [
i for i in range(len(feature_types))
if feature_types[i] == "Categorical"
]
other_index = [
i for i in range(len(feature_types))
if feature_types[i] != "Categorical"
]
encoder = OneHotEncoder(handle_unknown="ignore")
(train_x, _), (valid_x,
_), (test_x,
_) = dm.get_train(), dm.get_val(), dm.get_test()
train_size = len(train_x)
valid_size = 0
test_size = 0
if train_x is None:
raise ValueError("train_x has no value!!!")
if valid_x is not None and test_x is not None:
x = np.concatenate([train_x, valid_x, test_x])
valid_size = len(valid_x)
test_size = len(test_x)
elif valid_x is not None:
x = np.concatenate([train_x, valid_x])
valid_size = len(valid_x)
else:
x = train_x
categorical_x = x[:, categorical_index]
other_x = x[:, other_index]
encoder.fit(categorical_x)
categorical_x = encoder.transform(categorical_x).toarray()
categorical_features = ["One-Hot"] * categorical_x.shape[1]
other_features = [feature_types[i] for i in other_index]
x = np.hstack((categorical_x, other_x)).astype(np.float)
dm.feature_types = np.concatenate((categorical_features, other_features))
train_x, valid_x, test_x = _split_data(x, train_size, valid_size,
test_size)
if valid_size == 0:
valid_x = None
if test_size == 0:
test_x = None
dm.train_X = train_x
dm.val_X = valid_x
dm.test_X = test_x
return dm
print("after normalize rescale\n")
print(dm.train_X)
print(dm.val_X)
print(dm.test_X)
print(dm.feature_types)
if __name__ == '__main__':
np.random.seed(19941125)
dm = DataManager()
dm.train_X = np.random.rand(5, 5)
dm.val_X = np.random.rand(3, 5)
dm.test_X = np.random.rand(2, 5)
dm.feature_types = ["Discrete", "One-Hot", "Float", "Float", "Categorical"]
print("Original data......\n")
print(dm.train_X)
print(dm.val_X)
print(dm.test_X)
print(dm.feature_types)
print("start test MinMaxScaler.......\n")
test_minmax(dm)
print("start test StandardScaler......\n")
test_standard(dm)
print("start test MaxAbsScaler......\n")
test_maxabs(dm)