input: Write a function to generate a machine learning model using scikit-learn to classify digits in the MNIST dataset.
  assert generate_mnist_model(X, y)==clf
  assert clf.predict([X[0]])[0]==y[0]
output: def generate_mnist_model(X, y):
      from sklearn.svm import SVC
      clf = SVC(gamma='scale')
      clf.fit(X, y)
      return clf