add protobuf to pip installation instruction

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  1. README.md +1 -1
README.md CHANGED
@@ -486,7 +486,7 @@ Find below some example scripts on how to use the model:
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  First, install the Python packages that are required:
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- `pip install transformers accelerate sentencepiece`
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  ```python
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  from transformers import T5ForConditionalGeneration, T5Tokenizer
 
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  First, install the Python packages that are required:
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+ `pip install transformers accelerate sentencepiece protobuf`
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  ```python
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  from transformers import T5ForConditionalGeneration, T5Tokenizer