Fix `AttributeError: 'Phi3ForCausalLM' object has no attribute 'generate'` with transformers>=4.52

modeling_phi3.py

@@ -26,6 +26,7 @@ from torch import nn
 from torch.nn import BCEWithLogitsLoss, CrossEntropyLoss, MSELoss
 from transformers.activations import ACT2FN
 from transformers.cache_utils import Cache, DynamicCache
+from transformers.generation import GenerationMixin
 from transformers.modeling_attn_mask_utils import \
     _prepare_4d_causal_attention_mask
 from transformers.modeling_outputs import (BaseModelOutputWithPast,
@@ -1201,7 +1202,7 @@ class Phi3Model(Phi3PreTrainedModel):
         )
 
 
-class Phi3ForCausalLM(Phi3PreTrainedModel):
+class Phi3ForCausalLM(Phi3PreTrainedModel, GenerationMixin):
     _tied_weights_keys = ['lm_head.weight']
 
     # Copied from transformers.models.llama.modeling_llama.LlamaForCausalLM.__init__ with Llama->Phi3