Move python files to root folder; remove built docs

miplearn/classifiers/__init__.py

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+#  MIPLearn: Extensible Framework for Learning-Enhanced Mixed-Integer Optimization
+#  Copyright (C) 2020, UChicago Argonne, LLC. All rights reserved.
+#  Released under the modified BSD license. See COPYING.md for more details.
+
+from abc import ABC, abstractmethod
+
+import numpy as np
+
+
+class Classifier(ABC):
+    @abstractmethod
+    def fit(self, x_train, y_train):
+        pass
+
+    @abstractmethod
+    def predict_proba(self, x_test):
+        pass
+
+    def predict(self, x_test):
+        proba = self.predict_proba(x_test)
+        assert isinstance(proba, np.ndarray)
+        assert proba.shape == (x_test.shape[0], 2)
+        return (proba[:, 1] > 0.5).astype(float)
+
+
+class Regressor(ABC):
+    @abstractmethod
+    def fit(self, x_train, y_train):
+        pass
+
+    @abstractmethod
+    def predict(self):
+        pass