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Commit e0e9c97d authored by haileyschoelkopf's avatar haileyschoelkopf
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remove pure seq2seq LM class

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lm_eval/models/seq2seq.py deleted 100644 → 0
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import torch
import transformers
import copy
from tqdm import tqdm
import torch.nn.functional as F
from lm_eval import utils
from lm_eval.logger import eval_logger
from lm_eval.api.registry import register_model
from lm_eval.api.model import LM
from lm_eval.utils import MultiTokenEOSCriteria, stop_sequences_criteria
from accelerate import Accelerator
@register_model("hf-seq2seq", "seq2seq")
class Seq2SeqHFLM(LM):
_DEFAULT_MAX_LENGTH: int = 2048
def __init__(
self,
device="cuda",
pretrained="t5-small",
revision="main",
low_cpu_mem_usage=None,
subfolder=None,
tokenizer=None,
batch_size=1,
):
super().__init__()
assert isinstance(device, str)
assert isinstance(pretrained, str)
assert isinstance(batch_size, int)
gpus = torch.cuda.device_count()
if gpus <= 1:
if device:
if device not in ["cuda", "cpu"]:
device = int(device)
self._device = torch.device(device)
print(f"Using device '{device}'")
else:
print("Device not specified")
print(f"Cuda Available? {torch.cuda.is_available()}")
self._device = (
torch.device("cuda")
if torch.cuda.is_available()
else torch.device("cpu")
)
self._rank = 0
self._world_size = 1
else:
self._device = "cpu"
# TODO: update this to be less of a hack once subfolder is fixed in HF
revision = revision + ("/" + subfolder if subfolder is not None else "")
self.model = transformers.AutoModelForSeq2SeqLM.from_pretrained(
pretrained, revision=revision, low_cpu_mem_usage=low_cpu_mem_usage
).to(self.device)
self.model.eval()
self.tokenizer = transformers.AutoTokenizer.from_pretrained(
pretrained if tokenizer is None else tokenizer,
revision=revision,
)
self.vocab_size = self.tokenizer.vocab_size
# multithreading and batching
self.batch_size_per_gpu = batch_size
if gpus > 1:
accelerator = Accelerator()
if gpus > accelerator.num_processes:
warning = (
"WARNING: The number of total system GPUs does not match the number of spawned processes. "
"If you would like to use data parallelism, please launch the script "
"with 'accelerate launch *script*'. "
f"Current run will proceed with {accelerator.num_processes} devices."
)
print(warning)
self._rank = accelerator.local_process_index
self._world_size = accelerator.num_processes
# manually set model to use gpu, for case where many GPUs available but
# only seek to use one
self._device = (
torch.device(f"cuda:{accelerator.local_process_index}")
if torch.cuda.is_available()
else torch.device("cpu")
)
self.model.to(self.device)
else:
self.model = accelerator.prepare(self.model)
self._device = torch.device(f"cuda:{accelerator.local_process_index}")
self.accelerator = accelerator
if self.accelerator.is_local_main_process:
print(f"Using {gpus} devices with data parallelism")
self._rank = self.accelerator.local_process_index
self._world_size = self.accelerator.num_processes
@property
def eot_token_id(self):
# we use EOT because end of *text* is more accurate for what we're doing than end of *sentence*
return self.tokenizer.eos_token_id
@property
def max_length(self):
return self._DEFAULT_MAX_LENGTH # TODO: Is this a good default?
@property
def max_gen_toks(self):
return 256
@property
def batch_size(self):
return self.batch_size_per_gpu
@property
def device(self):
return self._device
@property
def rank(self):
return self._rank
@property
def world_size(self):
return self._world_size
def tok_encode(self, string: str):
return self.tokenizer.encode(string, add_special_tokens=True)
def tok_decode(self, tokens):
return self.tokenizer.decode(tokens, skip_special_tokens=True)
def _model_call(self, inps, attn_mask=None, labels=None):
"""
inps: a torch tensor of shape [batch, sequence_ctx]
the size of sequence may vary from call to call
labels: a torch tensor of shape [batch, sequence_cont]
the size of sequence may vary from call to call
returns: a torch tensor of shape [batch, sequence, vocab] with the
logits returned from the model
"""
with torch.no_grad():
return self.model(
input_ids=inps, attention_mask=attn_mask, labels=labels
).logits
def _model_generate(self, context, max_length, stop, **generation_kwargs):
# we require users to pass do_sample=True explicitly
# for non-greedy gen. This should be reevaluated when considering beam search.
if "do_sample" not in generation_kwargs.keys():
generation_kwargs["do_sample"] = False
# build stopping criteria
stopping_criteria = stop_sequences_criteria(
self.tokenizer, stop, 1, context.shape[0]
)
if hasattr(self, "accelerator"):
return self.accelerator.unwrap_model(self.model).generate(
context,
max_new_tokens=max_length,
stopping_criteria=stopping_criteria,
pad_token_id=self.eot_token_id,
**generation_kwargs,
)
else:
return self.model.generate(
context,
max_new_tokens=max_length,
stopping_criteria=stopping_criteria,
pad_token_id=self.eot_token_id,
**generation_kwargs,
)
def loglikelihood(self, requests):
new_reqs = []
for context, continuation in [req.args for req in requests]:
if context == "":
# end of text as context
context_enc = [self.eot_token_id]
else:
context_enc = self.tok_encode(context)
continuation_enc = self.tok_encode(continuation)
new_reqs.append(((context, continuation), context_enc, continuation_enc))
return self._loglikelihood_tokens(new_reqs)
def loglikelihood_rolling(self, requests):
loglikelihoods = []
for (string,) in tqdm([req.args for req in requests], disable=(self.rank != 0)):
rolling_token_windows = list(
map(
utils.make_disjoint_window,
utils.get_rolling_token_windows(
token_list=self.tok_encode(string),
prefix_token=self.eot_token_id,
max_seq_len=self.max_length,
context_len=1,
),
)
)
# TODO: Right now, we pass single EOT token to the Encoder and the full context to the decoder
rolling_token_windows = [(None,) + x for x in rolling_token_windows]
pad_amnt = 0
if self.world_size > 1:
# We pad out the external document-level iterator so the inner iterator doesn't hang
mytensor = torch.tensor(len(rolling_token_windows), device=self.device)
gathered = (
self.accelerator.gather(mytensor).cpu().detach().numpy().tolist()
)
pad_amnt = max(gathered) - gathered[self.rank]
if pad_amnt > 0:
rolling_token_windows += pad_amnt * [rolling_token_windows[0]]
string_nll = self._loglikelihood_tokens(
rolling_token_windows, disable_tqdm=True
)
if (self.world_size > 1) and (pad_amnt > 0):
string_nll = [x[0] for x in string_nll[:-pad_amnt]]
else:
# discard is_greedy
string_nll = [x[0] for x in string_nll]
string_nll = sum(string_nll)
loglikelihoods.append(string_nll)
return loglikelihoods
def _loglikelihood_tokens(self, requests, disable_tqdm=False):
res = []
def _collate(x):
# the negative sign on len(toks) sorts descending - this has a few advantages:
# - time estimates will always be over not underestimates, which is more useful for planning
# - to know the size of a batch when going through the list, you know the first one is always the batch
# padded context length. this is useful to simplify the batching logic and more importantly to make
# automatic adaptive batches much much easier to implement
# - any OOMs will happen right away rather than near the end
toks = x[1] + x[2]
return -len(toks), tuple(toks)
re_ord = utils.Reorderer(requests, _collate)
for chunk in utils.chunks(
tqdm(re_ord.get_reordered(), disable=(disable_tqdm or (self.rank != 0))),
self.batch_size,
):
inps = []
conts = []
encoder_attns = []
cont_toks_list = []
max_batch_length_inp = None
max_batch_length_cont = None
for _, context_enc, continuation_enc in chunk:
# sanity check
assert len(context_enc) > 0
assert len(continuation_enc) > 0
assert len(continuation_enc) <= self.max_length
inp = torch.tensor(
(context_enc)[-self.max_length :],
dtype=torch.long,
).to(self.device)
(inplen,) = inp.shape
cont = torch.tensor(
(continuation_enc)[-self.max_length :],
dtype=torch.long,
).to(self.device)
(contlen,) = cont.shape
max_batch_length_inp = (
max(max_batch_length_inp, inplen)
if max_batch_length_inp is not None
else inplen
)
max_batch_length_cont = (
max(max_batch_length_cont, contlen)
if max_batch_length_cont is not None
else contlen
)
inps.append(inp) # [1, inp_len]
conts.append(cont) # [1, cont_len]
encoder_attns.append(torch.ones_like(inp))
cont_toks_list.append(continuation_enc)
batched_inps = utils.pad_and_concat(
max_batch_length_inp, inps
) # [batch, padding_length]
batched_conts = utils.pad_and_concat(
max_batch_length_cont, conts
) # [batch, padding_length]
batched_encoder_mask = utils.pad_and_concat(
max_batch_length_inp, encoder_attns
)
# need to make attention mask here too
multi_logits = F.log_softmax(
self._model_call(
batched_inps, attn_mask=batched_encoder_mask, labels=batched_conts
),
dim=-1,
).cpu() # [batch, padding_length, vocab]
for (cache_key, _, _), logits, cont_toks in zip(
chunk, multi_logits, cont_toks_list
):
# Slice to original seq length
contlen = len(cont_toks)
logits = logits[:contlen].unsqueeze(0) # [1, seq, vocab]
# Check if per-token argmax is exactly equal to continuation
greedy_tokens = logits.argmax(dim=-1)
cont_toks = torch.tensor(cont_toks, dtype=torch.long).unsqueeze(
0
) # [1, seq]
max_equal = (greedy_tokens == cont_toks).all()
# Obtain log-probs at the corresponding continuation token indices
logits = torch.gather(logits, 2, cont_toks.unsqueeze(-1)).squeeze(
-1
) # [1, seq]
# Answer: (log prob, is-exact-match)
answer = (float(logits.sum()), bool(max_equal))
res.append(answer)
return re_ord.get_original(res)
def greedy_until(self, requests):
res = []
def _collate(x):
toks = self.tok_encode(x[0])
return len(toks), x[0]
re_ord = utils.Reorderer([req.args for req in requests], _collate)
for context, gen_kwargs in tqdm(re_ord.get_reordered()):
until = None
if isinstance(gen_kwargs, dict):
gen_kwargs = copy.deepcopy(gen_kwargs) # edge case for repeats > 1
print(gen_kwargs)
if "until" in gen_kwargs.keys():
until = gen_kwargs.pop("until")
if isinstance(until, str):
until = [gen_kwargs]
elif not isinstance(until, list):
raise ValueError(
f"Expected `gen_kwargs['until']` to be of type Union[str,list] but got {until}"
)
else:
raise ValueError(
f"Expected `gen_kwargs` to be of type `dict` but got {gen_kwargs}"
)
if not until:
until = [self.tok_decode(self.eot_token_id)]
if "max_gen_toks" in gen_kwargs.keys():
max_gen_toks = gen_kwargs.pop("max_gen_toks")
else:
max_gen_toks = self.max_gen_toks
(primary_until) = until[0]
context_enc = torch.tensor(
[self.tok_encode(context)[-self.max_length :]]
).to(self.device)
cont = self._model_generate(
context=context_enc,
max_length=context_enc.shape[1] + max_gen_toks,
stop=primary_until,
**gen_kwargs,
)
s = self.tok_decode(cont[0].tolist())
print(s)
for term in until:
s = s.split(term)[0]
print(s)
res.append(s)
return re_ord.get_original(res)
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