Add Support for Different Model Types #4

ONNX models are serialised version of the current AI models. They are a bit faster from the normal pytorch or huggingface therefore some users might want to use this type of models.

We already do have a model converted and added to huggingface:
https://huggingface.co/TextCortex/codegen-350M-optimized

In total we need to support following model types:

• Pytorch: Filename extension .pt
• Hugginface: Filename extension .bin
• ONNX: Filename extension .onnx

Here is the script for supporting text generation for ONNX models with optimum library from huggingface:

from transformers import AutoTokenizer
from optimum.onnxruntime import ORTModelForCausalLM
# Load models
model = ORTModelForCausalLM.from_pretrained("TextCortex/codegen-350M-optimized")
tokenizer = AutoTokenizer.from_pretrained("TextCortex/codegen-350M-optimized")

def generate_onnx(prompt, min_length=16, temperature=0.1, num_return_sequences=1):
   generated_ids=model.generate(input_ids, min_length=min_length, temperature=temperature,
                                   num_return_sequences=num_return_sequences, early_stopping=True)
   out = tokenizer.decode(generated_ids[0], skip_special_tokens=True)
   return out

For the Vanilla Pytorch models .pt, you can directly use AutoModel class from transformers (which also works for the huggingface .bin model types.)