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import time |
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import torch |
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import torch.nn as nn |
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import argparse |
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import transformers |
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from gptq import GPTQ |
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from utils import find_layers, DEV, set_seed, get_wikitext2, get_ptb, get_c4, get_ptb_new, get_c4_new, get_loaders |
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import quant |
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def get_opt(model): |
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import torch |
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def skip(*args, **kwargs): |
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pass |
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torch.nn.init.kaiming_uniform_ = skip |
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torch.nn.init.uniform_ = skip |
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torch.nn.init.normal_ = skip |
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from transformers import OPTForCausalLM |
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model = OPTForCausalLM.from_pretrained(model, torch_dtype='auto') |
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model.seqlen = model.config.max_position_embeddings |
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return model |
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@torch.no_grad() |
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def opt_sequential(model, dataloader, dev): |
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print('Starting ...') |
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use_cache = model.config.use_cache |
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model.config.use_cache = False |
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layers = model.model.decoder.layers |
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model.model.decoder.embed_tokens = model.model.decoder.embed_tokens.to(dev) |
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model.model.decoder.embed_positions = model.model.decoder.embed_positions.to(dev) |
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if hasattr(model.model.decoder, 'project_out') and model.model.decoder.project_out: |
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model.model.decoder.project_out = model.model.decoder.project_out.to(dev) |
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if hasattr(model.model.decoder, 'project_in') and model.model.decoder.project_in: |
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model.model.decoder.project_in = model.model.decoder.project_in.to(dev) |
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layers[0] = layers[0].to(dev) |
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dtype = next(iter(model.parameters())).dtype |
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inps = torch.zeros((args.nsamples, model.seqlen, model.config.hidden_size), dtype=dtype, device=dev) |
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cache = {'i': 0, 'attention_mask': None} |
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class Catcher(nn.Module): |
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def __init__(self, module): |
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super().__init__() |
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self.module = module |
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def forward(self, inp, **kwargs): |
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inps[cache['i']] = inp |
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cache['i'] += 1 |
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cache['attention_mask'] = kwargs['attention_mask'] |
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raise ValueError |
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layers[0] = Catcher(layers[0]) |
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for batch in dataloader: |
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try: |
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model(batch[0].to(dev)) |
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except ValueError: |
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pass |
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layers[0] = layers[0].module |
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layers[0] = layers[0].cpu() |
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model.model.decoder.embed_tokens = model.model.decoder.embed_tokens.cpu() |
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model.model.decoder.embed_positions = model.model.decoder.embed_positions.cpu() |
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if hasattr(model.model.decoder, 'project_out') and model.model.decoder.project_out: |
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model.model.decoder.project_out = model.model.decoder.project_out.cpu() |
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if hasattr(model.model.decoder, 'project_in') and model.model.decoder.project_in: |
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model.model.decoder.project_in = model.model.decoder.project_in.cpu() |
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torch.cuda.empty_cache() |
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outs = torch.zeros_like(inps) |
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attention_mask = cache['attention_mask'] |
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print('Ready.') |
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quantizers = {} |
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for i in range(len(layers)): |
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layer = layers[i].to(dev) |
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subset = find_layers(layer) |
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gptq = {} |
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for name in subset: |
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gptq[name] = GPTQ(subset[name]) |
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gptq[name].quantizer = quant.Quantizer() |
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gptq[name].quantizer.configure(args.wbits, perchannel=True, sym=args.sym, mse=False, trits=args.trits) |
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def add_batch(name): |
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def tmp(_, inp, out): |
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gptq[name].add_batch(inp[0].data, out.data) |
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return tmp |
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handles = [] |
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for name in subset: |
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handles.append(subset[name].register_forward_hook(add_batch(name))) |
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for j in range(args.nsamples): |
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outs[j] = layer(inps[j].unsqueeze(0), attention_mask=attention_mask)[0] |
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for h in handles: |
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h.remove() |
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for name in subset: |
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print(f'Quantizing {name} in layer {i+1}/{len(layers)}...') |
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scale, zero, g_idx, _ = gptq[name].fasterquant(percdamp=args.percdamp, groupsize=args.groupsize, actorder=args.act_order) |
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quantizers['model.decoder.layers.%d.%s' % (i, name)] = (gptq[name].quantizer.cpu(), scale.cpu(), zero.cpu(), g_idx.cpu()) |
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gptq[name].free() |
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for j in range(args.nsamples): |
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outs[j] = layer(inps[j].unsqueeze(0), attention_mask=attention_mask)[0] |
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layers[i] = layer.cpu() |
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del layer |
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del gptq |
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torch.cuda.empty_cache() |
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inps, outs = outs, inps |
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model.config.use_cache = use_cache |
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return quantizers |
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@torch.no_grad() |
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def opt_eval(model, testenc, dev): |
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print('Evaluating ...') |
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testenc = testenc.input_ids |
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nsamples = testenc.numel() // model.seqlen |
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use_cache = model.config.use_cache |
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model.config.use_cache = False |
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layers = model.model.decoder.layers |
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model.model.decoder.embed_tokens = model.model.decoder.embed_tokens.to(dev) |
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model.model.decoder.embed_positions = model.model.decoder.embed_positions.to(dev) |
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if hasattr(model.model.decoder, 'project_out') and model.model.decoder.project_out: |
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model.model.decoder.project_out = model.model.decoder.project_out.to(dev) |
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if hasattr(model.model.decoder, 'project_in') and model.model.decoder.project_in: |
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model.model.decoder.project_in = model.model.decoder.project_in.to(dev) |
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layers[0] = layers[0].to(dev) |
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dtype = next(iter(model.parameters())).dtype |
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inps = torch.zeros((nsamples, model.seqlen, model.config.hidden_size), dtype=dtype, device=dev) |
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cache = {'i': 0, 'attention_mask': None} |
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class Catcher(nn.Module): |
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def __init__(self, module): |
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super().__init__() |
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self.module = module |
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def forward(self, inp, **kwargs): |
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inps[cache['i']] = inp |
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cache['i'] += 1 |
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cache['attention_mask'] = kwargs['attention_mask'] |
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raise ValueError |
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layers[0] = Catcher(layers[0]) |
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for i in range(nsamples): |
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batch = testenc[:, (i * model.seqlen):((i + 1) * model.seqlen)].to(dev) |
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try: |
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model(batch) |
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except ValueError: |
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pass |
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layers[0] = layers[0].module |
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layers[0] = layers[0].cpu() |
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model.model.decoder.embed_tokens = model.model.decoder.embed_tokens.cpu() |
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model.model.decoder.embed_positions = model.model.decoder.embed_positions.cpu() |
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if hasattr(model.model.decoder, 'project_out') and model.model.decoder.project_out: |
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model.model.decoder.project_out = model.model.decoder.project_out.cpu() |
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if hasattr(model.model.decoder, 'project_in') and model.model.decoder.project_in: |
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model.model.decoder.project_in = model.model.decoder.project_in.cpu() |
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torch.cuda.empty_cache() |
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outs = torch.zeros_like(inps) |
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attention_mask = cache['attention_mask'] |
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for i in range(len(layers)): |
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print(i) |
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layer = layers[i].to(dev) |
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if args.nearest: |
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subset = find_layers(layer) |
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for name in subset: |
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quantizer = quant.Quantizer() |
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quantizer.configure(args.wbits, perchannel=True, sym=args.sym, mse=False) |
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W = subset[name].weight.data |
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quantizer.find_params(W, weight=True) |
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subset[name].weight.data = quantizer.quantize(W).to(next(iter(layer.parameters())).dtype) |
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for j in range(nsamples): |
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outs[j] = layer(inps[j].unsqueeze(0), attention_mask=attention_mask)[0] |
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layers[i] = layer.cpu() |
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del layer |
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torch.cuda.empty_cache() |
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inps, outs = outs, inps |
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if model.model.decoder.final_layer_norm is not None: |
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model.model.decoder.final_layer_norm = model.model.decoder.final_layer_norm.to(dev) |
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if model.model.decoder.project_out is not None: |
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model.model.decoder.project_out = model.model.decoder.project_out.to(dev) |
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model.lm_head = model.lm_head.to(dev) |
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testenc = testenc.to(dev) |
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nlls = [] |
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for i in range(nsamples): |
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hidden_states = inps[i].unsqueeze(0) |
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if model.model.decoder.final_layer_norm is not None: |
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hidden_states = model.model.decoder.final_layer_norm(hidden_states) |
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if model.model.decoder.project_out is not None: |
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hidden_states = model.model.decoder.project_out(hidden_states) |
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lm_logits = model.lm_head(hidden_states) |
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shift_logits = lm_logits[:, :-1, :].contiguous() |
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shift_labels = testenc[:, (i * model.seqlen):((i + 1) * model.seqlen)][:, 1:] |
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loss_fct = nn.CrossEntropyLoss() |
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loss = loss_fct(shift_logits.view(-1, shift_logits.size(-1)), shift_labels.view(-1)) |
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neg_log_likelihood = loss.float() * model.seqlen |
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nlls.append(neg_log_likelihood) |
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ppl = torch.exp(torch.stack(nlls).sum() / (nsamples * model.seqlen)) |
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print(ppl.item()) |
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model.config.use_cache = use_cache |
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def opt_pack(model, quantizers, wbits, groupsize): |
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layers = find_layers(model) |
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layers = {n: layers[n] for n in quantizers} |
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quant.make_quant_linear(model, quantizers, wbits, groupsize) |
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qlayers = find_layers(model, [quant.QuantLinear]) |
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print('Packing ...') |
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for name in qlayers: |
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print(name) |
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quantizers[name], scale, zero, g_idx = quantizers[name] |
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qlayers[name].pack(layers[name], scale, zero, g_idx) |
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print('Done.') |
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return model |
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def load_quant(model, checkpoint, wbits, groupsize=-1, eval=True, warmup_autotune=True): |
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from transformers import OPTConfig, OPTForCausalLM |
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config = OPTConfig.from_pretrained(model) |
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def noop(*args, **kwargs): |
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pass |
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torch.nn.init.kaiming_uniform_ = noop |
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torch.nn.init.uniform_ = noop |
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torch.nn.init.normal_ = noop |
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torch.set_default_dtype(torch.half) |
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transformers.modeling_utils._init_weights = False |
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torch.set_default_dtype(torch.half) |
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model = OPTForCausalLM(config) |
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torch.set_default_dtype(torch.float) |
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model = model.eval() |
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layers = find_layers(model) |
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for name in ['model.decoder.project_out', 'model.decoder.project_in', 'lm_head']: |
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if name in layers: |
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del layers[name] |
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quant.make_quant_linear(model, layers, wbits, groupsize) |
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del layers |
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print('Loading model ...') |
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if checkpoint.endswith('.safetensors'): |
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from safetensors.torch import load_file as safe_load |
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model.load_state_dict(safe_load(checkpoint)) |
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else: |
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model.load_state_dict(torch.load(checkpoint)) |
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if warmup_autotune: |
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quant.autotune_warmup_linear(model, transpose=not (eval)) |
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model.seqlen = model.config.max_position_embeddings |
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print('Done.') |
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return model |
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def opt_multigpu(model, gpus): |
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model.model.decoder.embed_tokens = model.model.decoder.embed_tokens.to(gpus[0]) |
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model.model.decoder.embed_positions = model.model.decoder.embed_positions.to(gpus[0]) |
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if hasattr(model.model.decoder, 'project_in') and model.model.decoder.project_in: |
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model.model.decoder.project_in = model.model.decoder.project_in.to(gpus[0]) |
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if hasattr(model.model.decoder, 'project_out') and model.model.decoder.project_out: |
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model.model.decoder.project_out = model.model.decoder.project_out.to(gpus[-1]) |
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if hasattr(model.model.decoder, 'final_layer_norm') and model.model.decoder.final_layer_norm: |
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model.model.decoder.final_layer_norm = model.model.decoder.final_layer_norm.to(gpus[-1]) |
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import copy |
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model.lm_head = copy.deepcopy(model.lm_head).to(gpus[-1]) |
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cache = {'mask': None} |
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class MoveModule(nn.Module): |
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def __init__(self, module): |
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super().__init__() |
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self.module = module |
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self.dev = next(iter(self.module.parameters())).device |
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def forward(self, *inp, **kwargs): |
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inp = list(inp) |
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if inp[0].device != self.dev: |
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inp[0] = inp[0].to(self.dev) |
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if cache['mask'] is None or cache['mask'].device != self.dev: |
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cache['mask'] = kwargs['attention_mask'].to(self.dev) |
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kwargs['attention_mask'] = cache['mask'] |
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tmp = self.module(*inp, **kwargs) |
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return tmp |
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layers = model.model.decoder.layers |
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pergpu = math.ceil(len(layers) / len(gpus)) |
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for i in range(len(layers)): |
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layers[i] = MoveModule(layers[i].to(gpus[i // pergpu])) |
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model.gpus = gpus |
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def benchmark(model, input_ids, check=False): |
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input_ids = input_ids.to(model.gpus[0] if hasattr(model, 'gpus') else DEV) |
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torch.cuda.synchronize() |
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cache = {'past': None} |
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def clear_past(i): |
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def tmp(layer, inp, out): |
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if cache['past']: |
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cache['past'][i] = None |
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return tmp |
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for i, layer in enumerate(model.model.decoder.layers): |
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layer.register_forward_hook(clear_past(i)) |
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print('Benchmarking ...') |
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if check: |
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loss = nn.CrossEntropyLoss() |
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tot = 0. |
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def sync(): |
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if hasattr(model, 'gpus'): |
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for gpu in model.gpus: |
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torch.cuda.synchronize(gpu) |
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else: |
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torch.cuda.synchronize() |
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with torch.no_grad(): |
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attention_mask = torch.ones((1, input_ids.numel()), device=DEV) |
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times = [] |
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for i in range(input_ids.numel()): |
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tick = time.time() |
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out = model(input_ids[:, i].reshape(-1), past_key_values=cache['past'], attention_mask=attention_mask[:, :(i + 1)].reshape((1, -1))) |
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sync() |
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times.append(time.time() - tick) |
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print(i, times[-1]) |
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if check and i != input_ids.numel() - 1: |
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tot += loss(out.logits[0].to(DEV), input_ids[:, (i + 1)].to(DEV)).float() |
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cache['past'] = list(out.past_key_values) |
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del out |
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sync() |
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import numpy as np |
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print('Median:', np.median(times)) |
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if check: |
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print('PPL:', torch.exp(tot / (input_ids.numel() - 1)).item()) |
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if __name__ == '__main__': |
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parser = argparse.ArgumentParser() |
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parser.add_argument('model', type=str, help='OPT model to load; pass `facebook/opt-X`.') |
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parser.add_argument('dataset', type=str, choices=['wikitext2', 'ptb', 'c4'], help='Where to extract calibration data from.') |
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parser.add_argument('--seed', type=int, default=0, help='Seed for sampling the calibration data.') |
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parser.add_argument('--nsamples', type=int, default=128, help='Number of calibration data samples.') |
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parser.add_argument('--percdamp', type=float, default=.01, help='Percent of the average Hessian diagonal to use for dampening.') |
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parser.add_argument('--nearest', action='store_true', help='Whether to run the RTN baseline.') |
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parser.add_argument('--wbits', type=int, default=16, choices=[2, 3, 4, 8, 16], help='#bits to use for quantization; use 16 for evaluating base model.') |
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parser.add_argument('--trits', action='store_true', help='Whether to use trits for quantization.') |
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parser.add_argument('--groupsize', type=int, default=-1, help='Groupsize to use for quantization; default uses full row.') |
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parser.add_argument('--eval', action='store_true', help='evaluate quantized model.') |
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parser.add_argument('--save', type=str, default='', help='Save quantized checkpoint under this name.') |
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parser.add_argument('--save_safetensors', type=str, default='', help='Save quantized `.safetensors` checkpoint under this name.') |
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parser.add_argument('--load', type=str, default='', help='Load quantized model.') |
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parser.add_argument('--benchmark', type=int, default=0, help='Number of tokens to use for benchmarking.') |
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parser.add_argument('--check', action='store_true', help='Whether to compute perplexity during benchmarking for verification.') |
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parser.add_argument('--sym', action='store_true', help='Whether to perform symmetric quantization.') |
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parser.add_argument('--act-order', action='store_true', help='Whether to apply the activation order GPTQ heuristic') |
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parser.add_argument('--new-eval', action='store_true', help='Whether to use the new PTB and C4 eval') |
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args = parser.parse_args() |
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if type(args.load) is not str: |
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args.load = args.load.as_posix() |
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if args.load: |
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model = load_quant(args.model, args.load, args.wbits, args.groupsize) |
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else: |
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model = get_opt(args.model) |
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model.eval() |
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dataloader, testloader = get_loaders(args.dataset, nsamples=args.nsamples, seed=args.seed, model=args.model, seqlen=model.seqlen) |
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if not args.load and args.wbits < 16 and not args.nearest: |
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tick = time.time() |
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quantizers = opt_sequential(model, dataloader, DEV) |
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print(time.time() - tick) |
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if args.benchmark: |
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gpus = [torch.device('cuda:%d' % i) for i in range(torch.cuda.device_count())] |
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if len(gpus) > 1: |
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opt_multigpu(model, gpus) |
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else: |
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model = model.to(DEV) |
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if args.benchmark: |
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input_ids = next(iter(dataloader))[0][:, :args.benchmark] |
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benchmark(model, input_ids, check=args.check) |
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if args.eval: |
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datasets = ['wikitext2', 'ptb', 'c4'] |
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if args.new_eval: |
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datasets = ['wikitext2', 'ptb-new', 'c4-new'] |
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for dataset in datasets: |
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dataloader, testloader = get_loaders(dataset, seed=args.seed, model=args.model, seqlen=model.seqlen) |
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print(dataset) |
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opt_eval(model, testloader, DEV) |
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if args.save: |
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opt_pack(model, quantizers, args.wbits, args.groupsize) |
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torch.save(model.state_dict(), args.save) |
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if args.save_safetensors: |
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opt_pack(model, quantizers, args.wbits, args.groupsize) |
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from safetensors.torch import save_file as safe_save |
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state_dict = model.state_dict() |
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state_dict = {k: v.clone().contiguous() for k, v in state_dict.items()} |
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safe_save(state_dict, args.save_safetensors) |
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