iliyaML
/

phi-2-chatml

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 library_name: transformers
-tags: []
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 ---
 library_name: transformers
+license: mit
 ---
 # Model Card for Model ID
 <!-- Provide a quick summary of what the model is/does. -->
+Based on: https://huggingface.co/microsoft/phi-2
+Summary of changes made:
+1. Add new special tokens for padding ([PAD]) and ChatML tokens (<|im_start|>, <|im_start|>) for further finetuning on instruction/chat datasets
+2. Resize embedding layer and final output layer
+  - https://huggingface.co/microsoft/phi-2/discussions/22#659d8ba950c1bbee5be6f179
+    - Original embedding size is 51200, but only 50295 tokens were used
+    - Resized the final embdedding matrix to avoid confusion, now aligns with tokenizer vocabulary
+  - https://huggingface.co/microsoft/phi-2/discussions/43#659d8d3418dc7360290a4734
+# Code for Reproducibility
+```python
+import torch
+import transformers
+transformers.set_seed(42)
+torch.set_default_device("cuda")
+model_checkpoint = "microsoft/phi-2"
+tokenizer = transformers.AutoTokenizer.from_pretrained(model_checkpoint)
+model = transformers.AutoModelForCausalLM.from_pretrained(model_checkpoint, torch_dtype=torch.float16, trust_remote_code=True)
+num_added_tokens = tokenizer.add_special_tokens({'additional_special_tokens': ['<|im_start|>', '<|im_end|>'], 'pad_token': '[PAD]'})
+model.resize_token_embeddings(len(tokenizer))
+```