adds no_split_modules

Adds _no_split_modules attribute on the EncoderDecoder class for accelerate support

modeling_codet5p.py

@@ -758,6 +758,7 @@ def shift_tokens_right(input_ids: torch.Tensor, pad_token_id: int, decoder_start
 # Adapted from transformers.models.encoder_decoder.modeling_encoder_decoder.EncoderDecoderModel
 class CodeT5pEncoderDecoderModel(PreTrainedModel):
     config_class = CodeT5pConfig
+    _no_split_modules = ["CodeT5pBlock"]
 
     def __init__(
             self,