style: format code with Autopep8, Black, ClangFormat, dotnet-format, …

…Go fmt, Gofumpt, Google Java Format, isort, Ktlint, PHP CS Fixer, Prettier, RuboCop, Ruff Formatter, Rustfmt, Scalafmt, StandardJS, StandardRB, swift-format and Yapf

This commit fixes the style issues introduced in 6469eb1 according to the output
from Autopep8, Black, ClangFormat, dotnet-format, Go fmt, Gofumpt, Google Java
Format, isort, Ktlint, PHP CS Fixer, Prettier, RuboCop, Ruff Formatter, Rustfmt,
Scalafmt, StandardJS, StandardRB, swift-format and Yapf.

Details: None

machine_learning/machine_learning.py

@@ -1,19 +1,20 @@
-import pandas as pd
 import numpy as np
+import pandas as pd
 from sklearn.linear_model import LinearRegression
 
+
 class MachineLearning:
     def __init__(self):
         pass
 
     def train_model(self, data):
-        X = data[['feature1', 'feature2']]
-        y = data['target']
+        X = data[["feature1", "feature2"]]
+        y = data["target"]
         model = LinearRegression()
         model.fit(X, y)
         return model
 
     def predict(self, model, data):
-        X = data[['feature1', 'feature2']]
+        X = data[["feature1", "feature2"]]
         y = model.predict(X)
         return y