[Phi] bias should be True (#35650)

bias should be True

Author: ArthurZucker

src/transformers/models/phi/modeling_phi.py

@@ -727,7 +727,7 @@ def __init__(self, config):
         super().__init__(config)
         self.model = PhiModel(config)
         self.vocab_size = config.vocab_size
-        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)
+        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=True)
 
         # Initialize weights and apply final processing
         self.post_init()

src/transformers/models/phi/modular_phi.py

@@ -284,7 +284,9 @@ def forward(
 
 
 class PhiForCausalLM(LlamaForCausalLM):
-    pass
+    def __init__(self, config):
+        super().__init__(config)
+        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=True)
 
 
 class PhiForSequenceClassification(LlamaForSequenceClassification):