mirror of
https://github.com/bigscience-workshop/petals
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61 lines
2.7 KiB
Python
61 lines
2.7 KiB
Python
# Note: this code is being actively modified by justheuristic. If you want to change anything about it, please warn me.
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import os
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import torch
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import transformers
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from hivemind import use_hivemind_log_handler, get_logger
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from src.client.remote_model import DistributedBloomForCausalLM
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use_hivemind_log_handler("in_root_logger")
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logger = get_logger(__file__)
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INITIAL_PEERS = os.environ.get("INITIAL_PEERS")
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if not INITIAL_PEERS:
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raise RuntimeError("Must specify INITIAL_PEERS environment variable with one or more peer ids")
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INITIAL_PEERS = INITIAL_PEERS.split()
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MODEL_NAME = os.environ.get("MODEL_NAME")
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if not MODEL_NAME:
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raise RuntimeError("Must specify MODEL_NAME as an index of a transformer block to be tested")
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REF_NAME = os.environ.get("REF_NAME")
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def test_full_model_exact_match(atol_forward=1e-5, atol_inference=1e-3, prefix="bloom6b3"):
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tokenizer = transformers.BloomTokenizerFast.from_pretrained(MODEL_NAME)
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model = DistributedBloomForCausalLM.from_pretrained(MODEL_NAME, initial_peers=INITIAL_PEERS, prefix=prefix)
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assert len(model.transformer.h) == model.config.n_layer
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test_inputs = tokenizer("A cat sat on a mat", return_tensors='pt')['input_ids']
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parallel_outputs = model.forward(test_inputs).logits
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assert torch.all(torch.isfinite(parallel_outputs))
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logger.info("Forward outputs are finite")
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if REF_NAME:
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ref_model = transformers.AutoModelForCausalLM.from_pretrained(REF_NAME)
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dummy_mask = torch.ones_like(test_inputs, dtype=torch.bool)
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# note: this creates a dummy mask to make the test compatible with older transformer versions
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# prior to https://github.com/huggingface/transformers/pull/17837
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ref_outputs = ref_model.forward(test_inputs, attention_mask=dummy_mask).logits
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assert torch.allclose(ref_outputs, parallel_outputs, rtol=0, atol=atol_forward)
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else:
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logger.warning("Did not test exact match with local model: REF_NAME environment variable is not set")
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embs = model.transformer.word_embeddings(test_inputs)
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embs = model.transformer.word_embeddings_layernorm(embs)
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recurrent_outputs = []
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with model.transformer.h.inference_session() as sess:
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for t in range(embs.shape[1]):
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recurrent_outputs.append(sess.step(embs[:, t: t + 1, :]))
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recurrent_outputs = torch.cat(recurrent_outputs, dim=1)
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recurrent_outputs = model.transformer.ln_f(recurrent_outputs)
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dictionary = model.transformer.word_embeddings.weight.t()
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recurrent_outputs = recurrent_outputs.to(dictionary.dtype)
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recurrent_outputs = (recurrent_outputs @ dictionary).float()
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assert torch.allclose(recurrent_outputs, parallel_outputs, rtol=0, atol=atol_inference)
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logger.info("Inference is consistent with forward")
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