Make loss calculation possible during eval mode

Previously, the loss was 0.0 during eval model which was faulty. Now the loss will be calculated during both training and eval modes.

modeling_pharia.py

@@ -771,7 +771,7 @@ class PhariaForCausalLM(PhariaPreTrainedModel):
                 "You have to specify the `labels` tensor when training the model."
             )
         
-        if self.training and labels is not None:
+        if labels is not None:
             # Shift logits and labels for causal language modeling
             shift_logits = logits[..., :-1, :].contiguous()
             shift_labels = labels[..., 1:].contiguous()