Create DummyMixer

dummymixer.py

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+from mixer import Mixer
+
+
+class DummyMixer(Mixer):
+    def mix_sentences(self, sentence_A: str, sentence_B: str, A_ratio: float, max_n_tokens: int = 140):
+        return f"This is a DummyMixer. {sentence_A=}, {sentence_B=} at {A_ratio=}, {max_n_tokens=}"

mixer.py

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+from abc import ABC, abstractmethod
+
+
+class Mixer(ABC):
+    @abstractmethod
+    def mix_sentences(self, sentence_A: str, sentence_B: str, A_ratio: float, max_n_tokens: int = 140):
+        raise NotImplementedError()