Fix CER/WER always equal to 1.0

Closes #24 (closed)
As in the predict.py code (see https://gitlab.com/teklia/atr/dan/-/blob/main/dan/predict.py#L153), to check if the end_token has been predicted, we should use == instead of is since it doesn't work correctly on tensors.

changed milestone to %ML Prod - December 2022 n°2

added P2 label

requested review from @schneider-y

assigned to @melodie.boillet

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• 98b85554 - Fix lint

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