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import os
from types import SimpleNamespace
import warnings
import torch
os.environ["RWKV_JIT_ON"] = "1"
os.environ["RWKV_CUDA_ON"] = "1"
from rwkv.model import RWKV
from rwkv.utils import PIPELINE, PIPELINE_ARGS
class RwkvModel:
def __init__(self, model_path):
warnings.warn(
"Experimental support. Please use ChatRWKV if you want to chat with RWKV"
)
self.config = SimpleNamespace(is_encoder_decoder=False)
self.model = RWKV(model=model_path, strategy="cuda fp16")
# two GPUs
# self.model = RWKV(model=model_path, strategy="cuda:0 fp16 *20 -> cuda:1 fp16")
self.tokenizer = None
self.model_path = model_path
def to(self, target):
assert target == "cuda"
def __call__(self, input_ids, use_cache, past_key_values=None):
assert use_cache == True
input_ids = input_ids[0].detach().cpu().numpy()
# print(input_ids)
logits, state = self.model.forward(input_ids, past_key_values)
# print(logits)
logits = logits.unsqueeze(0).unsqueeze(0)
out = SimpleNamespace(logits=logits, past_key_values=state)
return out
def generate(
self, input_ids, do_sample, temperature, max_new_tokens, repetition_penalty=1.0
):
# This function is used by fastchat.llm_judge.
# Because RWKV does not support huggingface generation API,
# we reuse fastchat.serve.inference.generate_stream as a workaround.
from transformers import AutoTokenizer
from fastchat.serve.inference import generate_stream
from fastchat.conversation import get_conv_template
if self.tokenizer is None:
self.tokenizer = AutoTokenizer.from_pretrained(
"EleutherAI/pythia-160m", use_fast=True
)
prompt = self.tokenizer.decode(input_ids[0].tolist())
conv = get_conv_template("rwkv")
gen_params = {
"model": self.model_path,
"prompt": prompt,
"temperature": temperature,
"repetition_penalty": repetition_penalty,
"max_new_tokens": max_new_tokens,
"stop": conv.stop_str,
"stop_token_ids": conv.stop_token_ids,
"echo": False,
}
res_iter = generate_stream(self, self.tokenizer, gen_params, "cuda")
for res in res_iter:
pass
output = res["text"]
output_ids = self.tokenizer.encode(output)
return [input_ids[0].tolist() + output_ids]
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