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eval_ppl_utils.py
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eval_ppl_utils.py
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import time
import torch
import torch.nn as nn
@torch.no_grad()
def llama_eval(model, testenc, dev, dataset: str, log_wandb: bool = False):
print("Evaluating ...")
testenc = testenc.input_ids
nsamples = testenc.numel() // model.seqlen
use_cache = model.config.use_cache
model.config.use_cache = False
layers = model.model.layers
model.model.embed_tokens = model.model.embed_tokens.to(dev)
layers[0] = layers[0].to(dev)
dtype = next(iter(model.parameters())).dtype
inps = torch.zeros(
(nsamples, model.seqlen, model.config.hidden_size), dtype=dtype, device=dev
)
cache = {"i": 0, "attention_mask": None}
class Catcher(nn.Module):
def __init__(self, module):
super().__init__()
self.module = module
def forward(self, inp, **kwargs):
inps[cache["i"]] = inp
cache["i"] += 1
cache["attention_mask"] = kwargs["attention_mask"]
raise ValueError
layers[0] = Catcher(layers[0])
for i in range(nsamples):
batch = testenc[:, (i * model.seqlen) : ((i + 1) * model.seqlen)].to(dev)
try:
model(batch)
except ValueError:
pass
layers[0] = layers[0].module
layers[0] = layers[0].cpu()
model.model.embed_tokens = model.model.embed_tokens.cpu()
torch.cuda.empty_cache()
outs = torch.zeros_like(inps)
attention_mask = cache["attention_mask"]
for i in range(len(layers)):
print(i)
layer = layers[i].to(dev)
for j in range(nsamples):
outs[j] = layer(inps[j].unsqueeze(0), attention_mask=attention_mask)[0]
layers[i] = layer.cpu()
del layer
torch.cuda.empty_cache()
inps, outs = outs, inps
if model.model.norm is not None:
model.model.norm = model.model.norm.to(dev)
model.lm_head = model.lm_head.to(dev)
testenc = testenc.to(dev)
nlls = []
for i in range(nsamples):
hidden_states = inps[i].unsqueeze(0)
if model.model.norm is not None:
hidden_states = model.model.norm(hidden_states)
lm_logits = model.lm_head(hidden_states)
shift_logits = lm_logits[:, :-1, :].contiguous()
shift_labels = testenc[:, (i * model.seqlen) : ((i + 1) * model.seqlen)][:, 1:]
loss_fct = nn.CrossEntropyLoss()
loss = loss_fct(
shift_logits.view(-1, shift_logits.size(-1)), shift_labels.view(-1)
)
neg_log_likelihood = loss.float() * model.seqlen
nlls.append(neg_log_likelihood)
ppl = torch.exp(torch.stack(nlls).sum() / (nsamples * model.seqlen))
print(f"Perplexity: {ppl.item():3f}")
model.config.use_cache = use_cache
@torch.no_grad()
def opt_eval(model, testenc, dev, dataset: str, log_wandb: bool = False):
print('Evaluating ...')
testenc = testenc.input_ids
nsamples = testenc.numel() // model.seqlen
use_cache = model.config.use_cache
model.config.use_cache = False
layers = model.model.decoder.layers
model.model.decoder.embed_tokens = model.model.decoder.embed_tokens.to(dev)
model.model.decoder.embed_positions = model.model.decoder.embed_positions.to(dev)
if hasattr(model.model.decoder, 'project_out') and model.model.decoder.project_out:
model.model.decoder.project_out = model.model.decoder.project_out.to(dev)
if hasattr(model.model.decoder, 'project_in') and model.model.decoder.project_in:
model.model.decoder.project_in = model.model.decoder.project_in.to(dev)
layers[0] = layers[0].to(dev)
dtype = next(iter(model.parameters())).dtype
inps = torch.zeros(
(nsamples, model.seqlen, model.config.hidden_size), dtype=dtype, device=dev
)
cache = {'i': 0, 'attention_mask': None}
class Catcher(nn.Module):
def __init__(self, module):
super().__init__()
self.module = module
def forward(self, inp, **kwargs):
inps[cache['i']] = inp
cache['i'] += 1
cache['attention_mask'] = kwargs['attention_mask']
raise ValueError
layers[0] = Catcher(layers[0])
for i in range(nsamples):
batch = testenc[:, (i * model.seqlen):((i + 1) * model.seqlen)].to(dev)
try:
model(batch)
except ValueError:
pass
layers[0] = layers[0].module
layers[0] = layers[0].cpu()
model.model.decoder.embed_tokens = model.model.decoder.embed_tokens.cpu()
model.model.decoder.embed_positions = model.model.decoder.embed_positions.cpu()
if hasattr(model.model.decoder, 'project_out') and model.model.decoder.project_out:
model.model.decoder.project_out = model.model.decoder.project_out.cpu()
if hasattr(model.model.decoder, 'project_in') and model.model.decoder.project_in:
model.model.decoder.project_in = model.model.decoder.project_in.cpu()
torch.cuda.empty_cache()
outs = torch.zeros_like(inps)
attention_mask = cache['attention_mask']
for i in range(len(layers)):
print(i)
layer = layers[i].to(dev)
for j in range(nsamples):
outs[j] = layer(inps[j].unsqueeze(0), attention_mask=attention_mask)[0]
layers[i] = layer.cpu()
del layer
torch.cuda.empty_cache()
inps, outs = outs, inps
if model.model.decoder.final_layer_norm is not None:
model.model.decoder.final_layer_norm = model.model.decoder.final_layer_norm.to(dev)
if model.model.decoder.project_out is not None:
model.model.decoder.project_out = model.model.decoder.project_out.to(dev)
model.lm_head = model.lm_head.to(dev)
testenc = testenc.to(dev)
nlls = []
for i in range(nsamples):
hidden_states = inps[i].unsqueeze(0)
if model.model.decoder.final_layer_norm is not None:
hidden_states = model.model.decoder.final_layer_norm(hidden_states)
if model.model.decoder.project_out is not None:
hidden_states = model.model.decoder.project_out(hidden_states)
lm_logits = model.lm_head(hidden_states)
shift_logits = lm_logits[:, :-1, :].contiguous()
shift_labels = testenc[
:, (i * model.seqlen):((i + 1) * model.seqlen)
][:, 1:]
loss_fct = nn.CrossEntropyLoss()
loss = loss_fct(shift_logits.view(-1, shift_logits.size(-1)), shift_labels.view(-1))
neg_log_likelihood = loss.float() * model.seqlen
nlls.append(neg_log_likelihood)
ppl = torch.exp(torch.stack(nlls).sum() / (nsamples * model.seqlen))
print(f"Perplexity: {ppl.item():3f}")
print({f'{dataset}/perplexity': ppl.item()})
model.config.use_cache = use_cache