RNN+Transformer hybrid with O(n) inference. Linear time, infinite context, no KV cache. Train like GPT (parallel), infer like RNN (sequential). Linux Foundation AI project. Production at Windows, Office, NeMo. RWKV-7 (March 2025). Models up to 14B parameters.
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RNN+Transformer hybrid with O(n) inference. Linear time, infinite context, no KV cache. Train like GPT (parallel), infer like RNN (sequential). Linux Foundation AI project. Production at Windows, Office, NeMo. RWKV-7 (March 2025). Models up to 14B parameters.
import os
from rwkv.model import RWKV
os.environ["RWKV_JIT_ON"] = '1'
os.environ["RWKV_CUDA_ON"] = '1'# Use CUDA kernel for speed# Load model
model = RWKV(
model='/path/to/RWKV-4-Pile-1B5-20220903-8040',
strategy='cuda fp16'
)
# GPT mode (parallel processing)
out, state = model.forward([187, 510, 1563, 310, 247], None)
print(out.detach().cpu().numpy()) # Logits# RNN mode (sequential processing, same result)
out, state = model.forward([187, 510], None) # First 2 tokens
out, state = model.forward([1563], state) # Next token
out, state = model.forward([310, 247], state) # Last tokensprint(out.detach().cpu().numpy()) # Same logits as above!
Common workflows
Workflow 1: Text generation (streaming)
Efficient token-by-token generation:
from rwkv.model import RWKV
from rwkv.utils import PIPELINE
model = RWKV(model='RWKV-4-Pile-14B-20230313-ctx8192-test1050', strategy='cuda fp16')
pipeline = PIPELINE(model, "20B_tokenizer.json")
# Initial prompt
prompt = "The future of AI is"
state = None# Generate token by tokenfor token in prompt:
out, state = pipeline.model.forward(pipeline.encode(token), state)
# Continue generationfor _ inrange(100):
out, state = pipeline.model.forward(None, state)
token = pipeline.sample_logits(out)
print(pipeline.decode(token), end='', flush=True)
Key advantage: Constant memory per token (no growing KV cache)
Workflow 2: Long context processing (infinite context)
Process million-token sequences:
model = RWKV(model='RWKV-4-Pile-14B', strategy='cuda fp16')
# Process very long document
state = None
long_document = load_document() # e.g., 1M tokens# Stream through entire documentfor chunk in chunks(long_document, chunk_size=1024):
out, state = model.forward(chunk, state)
# State now contains information from entire 1M token document# Memory usage: O(1) (constant, not O(n)!)
Workflow 3: Fine-tuning RWKV
Standard fine-tuning workflow:
# Training scriptimport pytorch_lightning as pl
from rwkv.model import RWKV
from rwkv.trainer import RWKVTrainer
# Configure model
config = {
'n_layer': 24,
'n_embd': 1024,
'vocab_size': 50277,
'ctx_len': 1024
}
# Setup trainer
trainer = pl.Trainer(
accelerator='gpu',
devices=8,
precision='bf16',
strategy='deepspeed_stage_2',
max_epochs=1
)
# Train
model = RWKV(config)
trainer.fit(model, train_dataloader)
# Transformer: O(n) per token (quadratic overall)# First token: 1 computation# Second token: 2 computations# ...# 1000th token: 1000 computations# RWKV: O(1) per token (linear overall)# Every token: 1 computation# 1000th token: 1 computation (same as first!)
When to use vs alternatives
Use RWKV when:
Need very long context (100K+ tokens)
Want constant memory usage
Building streaming applications
Need RNN efficiency with Transformer performance
Memory-constrained deployment
Key advantages:
Linear time: O(n) vs O(n²) for Transformers
No KV cache: Constant memory per token
Infinite context: No fixed window limit
Parallelizable training: Like GPT
Sequential inference: Like RNN
Use alternatives instead:
Transformers: Need absolute best performance, have compute
Mamba: Want state-space models
RetNet: Need retention mechanism
Hyena: Want convolution-based approach
Common issues
Issue: Out of memory during training
Use gradient checkpointing and DeepSpeed:
trainer = pl.Trainer(
strategy='deepspeed_stage_3', # Full ZeRO-3
precision='bf16'
)
Issue: Slow inference
Enable CUDA kernel:
os.environ["RWKV_CUDA_ON"] = '1'
Issue: Model not loading
Check model path and strategy:
model = RWKV(
model='/absolute/path/to/model.pth',
strategy='cuda fp16'# Or 'cpu fp32' for CPU
)
Issue: State management in RNN mode
Always pass state between forward calls:
# WRONG: State lost
out1, _ = model.forward(tokens1, None)
out2, _ = model.forward(tokens2, None) # No context from tokens1!# CORRECT: State preserved
out1, state = model.forward(tokens1, None)
out2, state = model.forward(tokens2, state) # Has context from tokens1
