code/provision/lightxml_model.py

import tqdm
import time
import cProfile
import numpy as np
from contextlib import contextmanager

try:
    from apex import amp
except Exception:  # pragma: no cover - fallback when apex is unavailable
    class _DummyAmp:
        def initialize(self, model, optimizer, opt_level="O1"):
            return model, optimizer

        @contextmanager
        def scale_loss(self, loss, optimizer):
            yield loss

    amp = _DummyAmp()

import torch
from torch import nn

from transformers import BertTokenizer, BertConfig, BertModel
from transformers import RobertaModel, RobertaConfig, RobertaTokenizer
from transformers import XLNetTokenizer, XLNetModel, XLNetConfig
from transformers import AutoConfig, AutoModel, AutoTokenizer

from tokenizers import BertWordPieceTokenizer
from transformers import RobertaTokenizerFast

def get_bert(bert_name):
    if 'roberta' in bert_name:
        print('load roberta-base')
        model_config = RobertaConfig.from_pretrained('roberta-base')
        model_config.output_hidden_states = True
        bert = RobertaModel.from_pretrained('roberta-base', config=model_config)
    elif 'xlnet' in bert_name:
        print('load xlnet-base-cased')
        model_config = XLNetConfig.from_pretrained('xlnet-base-cased')
        model_config.output_hidden_states = True
        bert = XLNetModel.from_pretrained('xlnet-base-cased', config=model_config)
    else:
        if bert_name in ['bert-base', 'bert-base-uncased']:
            print('load bert-base-uncased')
            model_config = BertConfig.from_pretrained('bert-base-uncased')
            model_config.output_hidden_states = True
            bert = BertModel.from_pretrained('bert-base-uncased', config=model_config)
        else:
            print(f'load {bert_name}')
            model_config = AutoConfig.from_pretrained(bert_name)
            model_config.output_hidden_states = True
            bert = AutoModel.from_pretrained(bert_name, config=model_config)
    return bert

class LightXML(nn.Module):
    def __init__(self, n_labels, group_y=None, bert='bert-base', feature_layers=5, dropout=0.5, update_count=1,

                 candidates_topk=10, 

                 use_swa=True, swa_warmup_epoch=10, swa_update_step=200, hidden_dim=300):
        super(LightXML, self).__init__()

        self.use_swa = use_swa
        self.swa_warmup_epoch = swa_warmup_epoch
        self.swa_update_step = swa_update_step
        self.swa_state = {}

        self.update_count = update_count

        self.candidates_topk = candidates_topk

        print('swa', self.use_swa, self.swa_warmup_epoch, self.swa_update_step, self.swa_state)
        print('update_count', self.update_count)

        self.bert_name, self.bert = bert, get_bert(bert)
        self.feature_layers, self.drop_out = feature_layers, nn.Dropout(dropout)

        self.group_y = group_y
        if self.group_y is not None:
            self.group_y_labels = group_y.shape[0]
            print('hidden dim:',  hidden_dim)
            print('label goup numbers:',  self.group_y_labels)

            self.l0 = nn.Linear(self.feature_layers*self.bert.config.hidden_size, self.group_y_labels)
            # hidden bottle layer
            self.l1 = nn.Linear(self.feature_layers*self.bert.config.hidden_size, hidden_dim)
            self.embed = nn.Embedding(n_labels, hidden_dim)
            nn.init.xavier_uniform_(self.embed.weight)
        else:
            self.l0 = nn.Linear(self.feature_layers*self.bert.config.hidden_size, n_labels)

    def get_candidates(self, group_logits, group_gd=None):
        logits = torch.sigmoid(group_logits.detach())
        if group_gd is not None:
            logits += group_gd
        k = min(self.candidates_topk, logits.shape[1])
        if k <= 0:
            raise ValueError("No group labels available for candidate selection")
        scores, indices = torch.topk(logits, k=k)
        scores, indices = scores.cpu().detach().numpy(), indices.cpu().detach().numpy()
        candidates, candidates_scores = [], []
        for index, score in zip(indices, scores):
            candidates.append(self.group_y[index])
            candidates_scores.append([np.full(c.shape, s) for c, s in zip(candidates[-1], score)])
            candidates[-1] = np.concatenate(candidates[-1])
            candidates_scores[-1] = np.concatenate(candidates_scores[-1])
        max_candidates = max([i.shape[0] for i in candidates])
        candidates = np.stack([np.pad(i, (0, max_candidates - i.shape[0]), mode='edge') for i in candidates])
        candidates_scores = np.stack([np.pad(i, (0, max_candidates - i.shape[0]), mode='edge') for i in candidates_scores])
        return indices, candidates, candidates_scores

    def forward(self, input_ids, attention_mask, token_type_ids,
                labels=None, group_labels=None, candidates=None):
        is_training = labels is not None

        outs = self.bert(
            input_ids,
            attention_mask=attention_mask,
            token_type_ids=token_type_ids
        )[-1]

        out = torch.cat([outs[-i][:, 0] for i in range(1, self.feature_layers+1)], dim=-1)
        out = self.drop_out(out)
        group_logits = self.l0(out)
        if self.group_y is None:
            logits = group_logits
            if is_training:
                loss_fn = torch.nn.BCEWithLogitsLoss()
                loss = loss_fn(logits, labels)
                return logits, loss
            else:
                return logits

        if is_training:
            l = labels.to(dtype=torch.bool)
            target_candidates = torch.masked_select(candidates, l).detach().cpu()
            target_candidates_num = l.sum(dim=1).detach().cpu()
        groups, candidates, group_candidates_scores = self.get_candidates(group_logits,
                                                                          group_gd=group_labels if is_training else None)
        if is_training:
            bs = 0
            new_labels = []
            for i, n in enumerate(target_candidates_num.numpy()):
                be = bs + n
                c = set(target_candidates[bs: be].numpy())
                c2 = candidates[i]
                new_labels.append(torch.tensor([1.0 if i in c else 0.0 for i in c2 ]))
                if len(c) != new_labels[-1].sum():
                    s_c2 = set(c2)
                    for cc in list(c):
                        if cc in s_c2:
                            continue
                        for j in range(new_labels[-1].shape[0]):
                            if new_labels[-1][j].item() != 1:
                                c2[j] = cc
                                new_labels[-1][j] = 1.0
                                break
                bs = be
            labels = torch.stack(new_labels).cuda()
        candidates, group_candidates_scores =  torch.LongTensor(candidates).cuda(), torch.Tensor(group_candidates_scores).cuda()

        emb = self.l1(out)
        embed_weights = self.embed(candidates) # N, sampled_size, H
        emb = emb.unsqueeze(-1)
        logits = torch.bmm(embed_weights, emb).squeeze(-1)

        if is_training:
            loss_fn = torch.nn.BCEWithLogitsLoss()
            loss = loss_fn(logits, labels) + loss_fn(group_logits, group_labels)
            return logits, loss
        else:
            candidates_scores = torch.sigmoid(logits)
            candidates_scores = candidates_scores * group_candidates_scores
            return group_logits, candidates, candidates_scores

    def get_accuracy(self, candidates, logits, labels):
        if candidates is not None:
            candidates = candidates.detach().cpu()
        k = min(10, logits.shape[1])
        if k <= 0:
            return 0, 0, 0, 0
        scores, indices = torch.topk(logits.detach().cpu(), k=k)

        acc1, acc3, acc5, total = 0, 0, 0, 0
        for i, l in enumerate(labels):
            if candidates is not None and l.shape[0] == candidates.shape[1]:
                positive_idx = np.nonzero(l)[0]
                target_labels = set(candidates[i][positive_idx].numpy())
            else:
                target_labels = set(np.nonzero(l)[0])

            if candidates is not None:
                pred_labels = candidates[i][indices[i]].numpy()
            else:
                pred_labels = indices[i, :5].numpy()

            acc1 += len(set([pred_labels[0]]) & target_labels)
            acc3 += len(set(pred_labels[:3]) & target_labels)
            acc5 += len(set(pred_labels[:5]) & target_labels)
            total += 1

        return total, acc1, acc3, acc5

    def one_epoch(self, epoch, dataloader, optimizer,
                  mode='train', eval_loader=None, eval_step=20000, log=None, log_interval=50, use_tqdm=False):

        total_steps = len(dataloader)
        bar = tqdm.tqdm(total=total_steps) if use_tqdm else None
        p1, p3, p5 = 0, 0, 0
        g_p1, g_p3, g_p5 = 0, 0, 0
        total, acc1, acc3, acc5 = 0, 0, 0, 0
        g_acc1, g_acc3, g_acc5 = 0, 0, 0
        train_loss = 0

        if mode == 'train':
            self.train()
            self.zero_grad()
        else:
            self.eval()

        if self.use_swa and epoch == self.swa_warmup_epoch and mode == 'train':
            self.swa_init()

        if self.use_swa and mode == 'eval':
            self.swa_swap_params()

        pred_scores, pred_labels = [], []
        if bar:
            bar.set_description(f'{mode}-{epoch}')

        device = next(self.parameters()).device

        def _gpu_mem():
            if device.type != "cuda":
                return "gpu_mem=NA"
            alloc = torch.cuda.memory_allocated(device) // (1024 * 1024)
            total = torch.cuda.get_device_properties(device).total_memory // (1024 * 1024)
            return f"gpu_mem={alloc}MB/{total}MB"

        with torch.set_grad_enabled(mode == 'train'):
            for step, data in enumerate(dataloader):
                batch = tuple(t for t in data)
                inputs = {'input_ids':      batch[0].to(device),
                          'attention_mask': batch[1].to(device),
                          'token_type_ids': batch[2].to(device)}
                if mode == 'train':
                    inputs['labels'] = batch[3].to(device)
                    if self.group_y is not None:
                        inputs['group_labels'] = batch[4].to(device)
                        inputs['candidates'] = batch[5].to(device)

                outputs = self(**inputs)
                if bar:
                    bar.update(1)

                if mode == 'train':
                    loss = outputs[1]
                    loss_group = outputs[2]
                    loss_rank = outputs[3]
                    loss_group = outputs[2]
                    loss_rank = outputs[3]
                    loss_group = outputs[2]
                    loss_rank = outputs[3]
                    loss_group = outputs[2]
                    loss_rank = outputs[3]
                    loss /= self.update_count
                    train_loss += loss.item()

                    with amp.scale_loss(loss, optimizer) as scaled_loss:
                        scaled_loss.backward()

                    if (step + 1) % self.update_count == 0:
                        optimizer.step()
                        self.zero_grad()

                    if step % eval_step == 0 and eval_loader is not None and step != 0:
                        results = self.one_epoch(epoch, eval_loader, optimizer, mode='eval')
                        p1, p3, p5 = results[3:6]
                        g_p1, g_p3, g_p5 = results[:3]
                        if self.group_y is not None:
                            log.log(f'{epoch:>2} {step:>6}: {p1:.4f}, {p3:.4f}, {p5:.4f}'
                                    f' {g_p1:.4f}, {g_p3:.4f}, {g_p5:.4f}')
                        else:
                            log.log(f'{epoch:>2} {step:>6}: {p1:.4f}, {p3:.4f}, {p5:.4f}')

                    if self.use_swa and step % self.swa_update_step == 0:
                        self.swa_step()

                    if bar:
                        bar.set_postfix(loss=loss.item())
                    if log_interval and step % log_interval == 0:
                        print(f"[train] epoch={epoch} step={step+1}/{len(dataloader)} "
                              f"loss={loss.item():.6f} loss_group={loss_group.item():.6f} "
                              f"loss_rank={loss_rank.item():.6f} {_gpu_mem()}")
                elif self.group_y is None:
                    logits = outputs
                    if mode == 'eval':
                        labels = batch[3]
                        _total, _acc1, _acc3, _acc5 = self.get_accuracy(None, logits, labels.cpu().numpy())
                        total += _total; acc1 += _acc1; acc3 += _acc3; acc5 += _acc5
                        p1 = acc1 / total
                        p3 = acc3 / total / 3
                        p5 = acc5 / total / 5
                        bar.set_postfix(p1=p1, p3=p3, p5=p5)
                    elif mode == 'test':
                        pred_scores.append(logits.detach().cpu())
                else:
                    group_logits, candidates, logits = outputs

                    if mode == 'eval':
                        labels = batch[3]
                        group_labels = batch[4]

                        _total, _acc1, _acc3, _acc5 = self.get_accuracy(candidates, logits, labels.cpu().numpy())
                        total += _total; acc1 += _acc1; acc3 += _acc3; acc5 += _acc5
                        p1 = acc1 / total
                        p3 = acc3 / total / 3
                        p5 = acc5 / total / 5

                        _, _g_acc1, _g_acc3, _g_acc5 = self.get_accuracy(None, group_logits, group_labels.cpu().numpy())
                        g_acc1 += _g_acc1; g_acc3 += _g_acc3; g_acc5 += _g_acc5
                        g_p1 = g_acc1 / total
                        g_p3 = g_acc3 / total / 3
                        g_p5 = g_acc5 / total / 5
                        if bar:
                            bar.set_postfix(p1=p1, p3=p3, p5=p5, g_p1=g_p1, g_p3=g_p3, g_p5=g_p5)
                        if log_interval and step % log_interval == 0:
                            print(f"[eval] epoch={epoch} step={step+1}/{len(dataloader)} "
                                  f"g_p1={g_p1:.4f} g_p3={g_p3:.4f} g_p5={g_p5:.4f} "
                                  f"p1={p1:.4f} p3={p3:.4f} p5={p5:.4f} {_gpu_mem()}")
                    elif mode == 'test':
                        k = min(100, logits.shape[1])
                        _scores, _indices = torch.topk(logits.detach().cpu(), k=k)
                        _labels = torch.stack([candidates[i][_indices[i]] for i in range(_indices.shape[0])], dim=0)
                        pred_scores.append(_scores.cpu())
                        pred_labels.append(_labels.cpu())

        if mode == 'train' and total_steps > 0 and total_steps % self.update_count != 0:
            optimizer.step()
            self.zero_grad()

        if self.use_swa and mode == 'eval':
            self.swa_swap_params()
        if bar:
            bar.close()

        if mode == 'eval':
            return g_p1, g_p3, g_p5, p1, p3, p5
        elif mode == 'test':
            return torch.cat(pred_scores, dim=0).numpy(), torch.cat(pred_labels, dim=0).numpy() if len(pred_labels) != 0 else None
        elif mode == 'train':
            return train_loss

    def save_model(self, path):
        self.swa_swap_params()
        torch.save(self.state_dict(), path)
        self.swa_swap_params()

    def swa_init(self):
        self.swa_state = {'models_num': 1}
        for n, p in self.named_parameters():
            self.swa_state[n] = p.data.cpu().clone().detach()

    def swa_step(self):
        if 'models_num' not in self.swa_state:
            return
        self.swa_state['models_num'] += 1
        beta = 1.0 / self.swa_state['models_num']
        with torch.no_grad():
            for n, p in self.named_parameters():
                self.swa_state[n].mul_(1.0 - beta).add_(beta, p.data.cpu())

    def swa_swap_params(self):
        if 'models_num' not in self.swa_state:
            return
        for n, p in self.named_parameters():
            self.swa_state[n], p.data =  self.swa_state[n].cpu(), p.data.cpu()
            self.swa_state[n], p.data =  p.data.cpu(), self.swa_state[n].cuda()

    def get_fast_tokenizer(self):
        if 'roberta' in self.bert_name:
            tokenizer = RobertaTokenizerFast.from_pretrained('roberta-base', do_lower_case=True)
        elif 'xlnet' in self.bert_name:
            tokenizer = XLNetTokenizer.from_pretrained('xlnet-base-cased') 
        elif self.bert_name in ['bert-base', 'bert-base-uncased']:
            tokenizer = BertWordPieceTokenizer(
                "data/.bert-base-uncased-vocab.txt",
                lowercase=True)
        else:
            tokenizer = AutoTokenizer.from_pretrained(self.bert_name, use_fast=True)
        return tokenizer

    def get_tokenizer(self):
        if 'roberta' in self.bert_name:
            print('load roberta-base tokenizer')
            try:
                tokenizer = RobertaTokenizer.from_pretrained('roberta-base', do_lower_case=True, local_files_only=True)
            except Exception:
                tokenizer = RobertaTokenizer.from_pretrained('roberta-base', do_lower_case=True)
        elif 'xlnet' in self.bert_name:
            print('load xlnet-base-cased tokenizer')
            try:
                tokenizer = XLNetTokenizer.from_pretrained('xlnet-base-cased', local_files_only=True)
            except Exception:
                tokenizer = XLNetTokenizer.from_pretrained('xlnet-base-cased')
        elif self.bert_name in ['bert-base', 'bert-base-uncased']:
            print('load bert-base-uncased tokenizer')
            try:
                tokenizer = BertTokenizer.from_pretrained('bert-base-uncased', do_lower_case=True, local_files_only=True)
            except Exception:
                tokenizer = BertTokenizer.from_pretrained('bert-base-uncased', do_lower_case=True)
        elif self.bert_name == 'bert-base-chinese':
            print('load bert-base-chinese tokenizer')
            try:
                tokenizer = BertTokenizer.from_pretrained('bert-base-chinese', local_files_only=True)
            except Exception:
                tokenizer = BertTokenizer.from_pretrained('bert-base-chinese')
        else:
            print(f'load {self.bert_name} tokenizer')
            try:
                tokenizer = AutoTokenizer.from_pretrained(self.bert_name, local_files_only=True)
            except Exception:
                tokenizer = AutoTokenizer.from_pretrained(self.bert_name)
        return tokenizer


class LightXMLMultiZone(nn.Module):
    def __init__(self, n_labels, bert='bert-base-chinese', feature_layers=5, dropout=0.5,
                 update_count=1, fusion='concat', hidden_dim=300):
        super(LightXMLMultiZone, self).__init__()

        self.update_count = update_count
        self.bert_name, self.bert = bert, get_bert(bert)
        self.feature_layers, self.drop_out = feature_layers, nn.Dropout(dropout)
        self.fusion = fusion

        self.hidden_size = self.bert.config.hidden_size * self.feature_layers
        if self.fusion == 'concat':
            self.fusion_proj = nn.Linear(self.hidden_size * 6, self.hidden_size)
        elif self.fusion == 'weighted':
            self.fusion_weight = nn.Parameter(torch.ones(6))
        elif self.fusion == 'attention':
            self.attn = nn.Linear(self.hidden_size, 1)
        else:
            raise ValueError(f"Unsupported fusion: {self.fusion}")

        self.l0 = nn.Linear(self.hidden_size, n_labels)

    def encode_zones(self, input_ids, attention_mask, token_type_ids):
        # input shape: (B, Z, L)
        bsz, zones, seqlen = input_ids.shape
        flat_ids = input_ids.view(bsz * zones, seqlen)
        flat_mask = attention_mask.view(bsz * zones, seqlen)
        flat_type = token_type_ids.view(bsz * zones, seqlen)

        outs = self.bert(
            flat_ids,
            attention_mask=flat_mask,
            token_type_ids=flat_type
        )[-1]

        cls = torch.cat([outs[-i][:, 0] for i in range(1, self.feature_layers + 1)], dim=-1)
        cls = cls.view(bsz, zones, -1)
        return cls

    def fuse(self, zone_reps, return_weights=False):
        if self.fusion == 'concat':
            fused = zone_reps.reshape(zone_reps.shape[0], -1)
            fused = self.fusion_proj(fused)
            if return_weights:
                return fused, None
            return fused
        if self.fusion == 'weighted':
            weights = torch.softmax(self.fusion_weight, dim=0)
            fused = (zone_reps * weights.view(1, -1, 1)).sum(dim=1)
            if return_weights:
                return fused, weights
            return fused
        if self.fusion == 'attention':
            attn_scores = self.attn(zone_reps).squeeze(-1)
            attn_weights = torch.softmax(attn_scores, dim=1)
            fused = (zone_reps * attn_weights.unsqueeze(-1)).sum(dim=1)
            if return_weights:
                return fused, attn_weights
            return fused
        raise ValueError(f"Unsupported fusion: {self.fusion}")


class LightXMLMultiZoneGroupY(nn.Module):
    def __init__(self, n_labels, group_y, bert='bert-base-chinese', feature_layers=5, dropout=0.5,
                 update_count=1, fusion='concat', hidden_dim=300, candidates_topk=20,
                 teacher_force_lambda=0.3):
        super(LightXMLMultiZoneGroupY, self).__init__()

        self.use_swa = True
        self.swa_warmup_epoch = 10
        self.swa_update_step = 200
        self.swa_state = {}

        self.update_count = update_count
        self.candidates_topk = candidates_topk
        self.teacher_force_lambda = teacher_force_lambda
        self.bert_name, self.bert = bert, get_bert(bert)
        self.feature_layers, self.drop_out = feature_layers, nn.Dropout(dropout)
        self.fusion = fusion
        self.group_y = group_y

        self.hidden_size = self.bert.config.hidden_size * self.feature_layers
        if self.fusion == 'concat':
            self.fusion_proj = nn.Linear(self.hidden_size * 6, self.hidden_size)
        elif self.fusion == 'weighted':
            self.fusion_weight = nn.Parameter(torch.ones(6))
        elif self.fusion == 'attention':
            self.attn = nn.Linear(self.hidden_size, 1)
        else:
            raise ValueError(f"Unsupported fusion: {self.fusion}")

        self.group_y_labels = group_y.shape[0]
        self.l0 = nn.Linear(self.hidden_size, self.group_y_labels)
        self.l1 = nn.Linear(self.hidden_size, hidden_dim)
        self.embed = nn.Embedding(n_labels, hidden_dim)
        nn.init.xavier_uniform_(self.embed.weight)

    def encode_zones(self, input_ids, attention_mask, token_type_ids):
        bsz, zones, seqlen = input_ids.shape
        flat_ids = input_ids.view(bsz * zones, seqlen)
        flat_mask = attention_mask.view(bsz * zones, seqlen)
        flat_type = token_type_ids.view(bsz * zones, seqlen)
        outs = self.bert(
            flat_ids,
            attention_mask=flat_mask,
            token_type_ids=flat_type
        )[-1]
        cls = torch.cat([outs[-i][:, 0] for i in range(1, self.feature_layers + 1)], dim=-1)
        return cls.view(bsz, zones, -1)

    def fuse(self, zone_reps):
        if self.fusion == 'concat':
            fused = zone_reps.reshape(zone_reps.shape[0], -1)
            return self.fusion_proj(fused)
        if self.fusion == 'weighted':
            weights = torch.softmax(self.fusion_weight, dim=0)
            return (zone_reps * weights.view(1, -1, 1)).sum(dim=1)
        if self.fusion == 'attention':
            attn_scores = self.attn(zone_reps).squeeze(-1)
            attn_weights = torch.softmax(attn_scores, dim=1)
            return (zone_reps * attn_weights.unsqueeze(-1)).sum(dim=1)
        raise ValueError(f"Unsupported fusion: {self.fusion}")

    def get_candidates(self, group_logits, group_gd=None):
        logits = torch.sigmoid(group_logits.detach())
        if group_gd is not None and self.teacher_force_lambda > 0:
            logits += self.teacher_force_lambda * group_gd
        k = min(self.candidates_topk, logits.shape[1])
        if k <= 0:
            raise ValueError("No group labels available for candidate selection")
        scores, indices = torch.topk(logits, k=k)
        scores, indices = scores.cpu().detach().numpy(), indices.cpu().detach().numpy()
        candidates, candidates_scores = [], []
        for index, score in zip(indices, scores):
            candidates.append(self.group_y[index])
            candidates_scores.append([np.full(c.shape, s) for c, s in zip(candidates[-1], score)])
            candidates[-1] = np.concatenate(candidates[-1])
            candidates_scores[-1] = np.concatenate(candidates_scores[-1])
        max_candidates = max([i.shape[0] for i in candidates])
        candidates = np.stack([np.pad(i, (0, max_candidates - i.shape[0]), mode='edge') for i in candidates])
        candidates_scores = np.stack([np.pad(i, (0, max_candidates - i.shape[0]), mode='edge') for i in candidates_scores])
        return indices, candidates, candidates_scores

    def forward(self, input_ids, attention_mask, token_type_ids,
                labels=None, group_labels=None, candidates=None):
        is_training = labels is not None
        zone_reps = self.encode_zones(input_ids, attention_mask, token_type_ids)
        out = self.drop_out(self.fuse(zone_reps))
        group_logits = self.l0(out)

        if is_training:
            l = labels.to(dtype=torch.bool)
            target_candidates = torch.masked_select(candidates, l).detach().cpu()
            target_candidates_num = l.sum(dim=1).detach().cpu()
        groups, candidates, group_candidates_scores = self.get_candidates(
            group_logits, group_gd=group_labels if is_training else None
        )
        if is_training:
            bs = 0
            new_labels = []
            for i, n in enumerate(target_candidates_num.numpy()):
                be = bs + n
                c = set(target_candidates[bs: be].numpy())
                c2 = candidates[i]
                new_labels.append(torch.tensor([1.0 if i in c else 0.0 for i in c2]))
                if len(c) != new_labels[-1].sum():
                    s_c2 = set(c2)
                    for cc in list(c):
                        if cc in s_c2:
                            continue
                        for j in range(new_labels[-1].shape[0]):
                            if new_labels[-1][j].item() != 1:
                                c2[j] = cc
                                new_labels[-1][j] = 1.0
                                break
                bs = be
            labels = torch.stack(new_labels).to(input_ids.device)

        candidates = torch.LongTensor(candidates).to(input_ids.device)
        group_candidates_scores = torch.Tensor(group_candidates_scores).to(input_ids.device)

        emb = self.l1(out)
        embed_weights = self.embed(candidates)
        emb = emb.unsqueeze(-1)
        logits = torch.bmm(embed_weights, emb).squeeze(-1)

        if is_training:
            loss_fn = torch.nn.BCEWithLogitsLoss()
            loss_rank = loss_fn(logits, labels)
            loss_group = loss_fn(group_logits, group_labels)
            loss = loss_rank + loss_group
            return logits, loss, loss_group.detach(), loss_rank.detach()
        else:
            candidates_scores = torch.sigmoid(logits)
            candidates_scores = candidates_scores * group_candidates_scores
            return group_logits, candidates, candidates_scores

    def get_accuracy(self, candidates, logits, labels):
        if candidates is not None:
            candidates = candidates.detach().cpu()
        k = min(10, logits.shape[1])
        if k <= 0:
            return 0, 0, 0, 0
        scores, indices = torch.topk(logits.detach().cpu(), k=k)

        acc1, acc3, acc5, total = 0, 0, 0, 0
        for i, l in enumerate(labels):
            if candidates is not None and l.shape[0] == candidates.shape[1]:
                positive_idx = np.nonzero(l)[0]
                target_labels = set(candidates[i][positive_idx].numpy())
            else:
                target_labels = set(np.nonzero(l)[0])

            if candidates is not None:
                pred_labels = candidates[i][indices[i]].numpy()
            else:
                pred_labels = indices[i, :5].numpy()

            acc1 += len(set([pred_labels[0]]) & target_labels)
            acc3 += len(set(pred_labels[:3]) & target_labels)
            acc5 += len(set(pred_labels[:5]) & target_labels)
            total += 1

        return total, acc1, acc3, acc5

    def one_epoch(self, epoch, dataloader, optimizer,
                  mode='train', eval_loader=None, eval_step=20000, log=None, log_interval=50, use_tqdm=False):

        total_steps = len(dataloader)
        bar = tqdm.tqdm(total=total_steps) if use_tqdm else None
        p1, p3, p5 = 0, 0, 0
        g_p1, g_p3, g_p5 = 0, 0, 0
        total, acc1, acc3, acc5 = 0, 0, 0, 0
        g_acc1, g_acc3, g_acc5 = 0, 0, 0
        cand_hit, cand_total = 0, 0
        train_loss = 0

        if mode == 'train':
            self.train()
            self.zero_grad()
        else:
            self.eval()

        if self.use_swa and epoch == self.swa_warmup_epoch and mode == 'train':
            self.swa_init()

        if self.use_swa and mode == 'eval':
            self.swa_swap_params()

        pred_scores, pred_labels = [], []
        if bar:
            bar.set_description(f'{mode}-{epoch}')

        device = next(self.parameters()).device

        def _gpu_mem():
            if device.type != "cuda":
                return "gpu_mem=NA"
            alloc = torch.cuda.memory_allocated(device) // (1024 * 1024)
            total = torch.cuda.get_device_properties(device).total_memory // (1024 * 1024)
            return f"gpu_mem={alloc}MB/{total}MB"

        with torch.set_grad_enabled(mode == 'train'):
            for step, data in enumerate(dataloader):
                batch = tuple(t for t in data)
                inputs = {'input_ids':      batch[0].to(device),
                          'attention_mask': batch[1].to(device),
                          'token_type_ids': batch[2].to(device)}
                if mode == 'train':
                    inputs['labels'] = batch[3].to(device)
                    inputs['group_labels'] = batch[4].to(device)
                    inputs['candidates'] = batch[5].to(device)

                outputs = self(**inputs)
                if bar:
                    bar.update(1)

                if mode == 'train':
                    loss = outputs[1]
                    loss_group = outputs[2]
                    loss_rank = outputs[3]
                    loss /= self.update_count
                    train_loss += loss.item()

                    with amp.scale_loss(loss, optimizer) as scaled_loss:
                        scaled_loss.backward()

                    if (step + 1) % self.update_count == 0:
                        optimizer.step()
                        self.zero_grad()

                    if step % eval_step == 0 and eval_loader is not None and step != 0:
                        results = self.one_epoch(epoch, eval_loader, optimizer, mode='eval')
                        p1, p3, p5 = results[3:6]
                        g_p1, g_p3, g_p5 = results[:3]
                        log.log(f'{epoch:>2} {step:>6}: {p1:.4f}, {p3:.4f}, {p5:.4f}'
                                f' {g_p1:.4f}, {g_p3:.4f}, {g_p5:.4f}')

                    if self.use_swa and step % self.swa_update_step == 0:
                        self.swa_step()

                    if bar:
                        bar.set_postfix(loss=loss.item())
                    if log_interval and step % log_interval == 0:
                        print(f"[train] epoch={epoch} step={step+1}/{len(dataloader)} "
                              f"loss={loss.item():.6f} loss_group={loss_group.item():.6f} "
                              f"loss_rank={loss_rank.item():.6f} {_gpu_mem()}")
                else:
                    group_logits, candidates, logits = outputs

                    if mode == 'eval':
                        labels = batch[3]
                        group_labels = batch[4]

                        _total, _acc1, _acc3, _acc5 = self.get_accuracy(candidates, logits, labels.cpu().numpy())
                        total += _total; acc1 += _acc1; acc3 += _acc3; acc5 += _acc5
                        p1 = acc1 / total
                        p3 = acc3 / total / 3
                        p5 = acc5 / total / 5

                        cand_np = candidates.detach().cpu().numpy()
                        labels_np = labels.cpu().numpy()
                        for i, l in enumerate(labels_np):
                            pos = np.nonzero(l)[0]
                            if pos.shape[0] == 0:
                                continue
                            cand_set = set(cand_np[i].tolist())
                            cand_hit += sum(1 for t in pos if t in cand_set)
                            cand_total += pos.shape[0]
                        candidate_recall = cand_hit / cand_total if cand_total > 0 else 0.0

                        _, _g_acc1, _g_acc3, _g_acc5 = self.get_accuracy(None, group_logits, group_labels.cpu().numpy())
                        g_acc1 += _g_acc1; g_acc3 += _g_acc3; g_acc5 += _g_acc5
                        g_p1 = g_acc1 / total
                        g_p3 = g_acc3 / total / 3
                        g_p5 = g_acc5 / total / 5
                        if bar:
                            bar.set_postfix(p1=p1, p3=p3, p5=p5, g_p1=g_p1, g_p3=g_p3, g_p5=g_p5,
                                            cand_recall=candidate_recall)
                        if log_interval and step % log_interval == 0:
                            print(f"[eval] epoch={epoch} step={step+1}/{len(dataloader)} "
                                  f"g_p1={g_p1:.4f} g_p3={g_p3:.4f} g_p5={g_p5:.4f} "
                                  f"p1={p1:.4f} p3={p3:.4f} p5={p5:.4f} "
                                  f"cand_recall={candidate_recall:.4f} {_gpu_mem()}")
                    elif mode == 'test':
                        k = min(100, logits.shape[1])
                        _scores, _indices = torch.topk(logits.detach().cpu(), k=k)
                        _labels = torch.stack([candidates[i][_indices[i]] for i in range(_indices.shape[0])], dim=0)
                        pred_scores.append(_scores.cpu())
                        pred_labels.append(_labels.cpu())

        if mode == 'train' and total_steps > 0 and total_steps % self.update_count != 0:
            optimizer.step()
            self.zero_grad()

        if self.use_swa and mode == 'eval':
            self.swa_swap_params()
        if bar:
            bar.close()

        if mode == 'eval':
            candidate_recall = cand_hit / cand_total if cand_total > 0 else 0.0
            return g_p1, g_p3, g_p5, p1, p3, p5, candidate_recall
        elif mode == 'test':
            return torch.cat(pred_scores, dim=0).numpy(), torch.cat(pred_labels, dim=0).numpy() if len(pred_labels) != 0 else None
        elif mode == 'train':
            return train_loss

    def swa_init(self):
        self.swa_state = {'models_num': 1}
        for n, p in self.named_parameters():
            self.swa_state[n] = p.data.detach().cpu().clone()

    def swa_step(self):
        if 'models_num' not in self.swa_state:
            return
        self.swa_state['models_num'] += 1
        beta = 1.0 / self.swa_state['models_num']
        with torch.no_grad():
            for n, p in self.named_parameters():
                self.swa_state[n].mul_(1.0 - beta).add_(beta, p.data.detach().cpu())

    def swa_swap_params(self):
        if 'models_num' not in self.swa_state:
            return
        for n, p in self.named_parameters():
            buf = self.swa_state[n]
            self.swa_state[n] = p.data.detach().cpu()
            p.data = buf.to(p.data.device)

    def get_tokenizer(self):
        if 'roberta' in self.bert_name:
            try:
                return RobertaTokenizer.from_pretrained('roberta-base', do_lower_case=True, local_files_only=True)
            except Exception:
                return RobertaTokenizer.from_pretrained('roberta-base', do_lower_case=True)
        if 'xlnet' in self.bert_name:
            try:
                return XLNetTokenizer.from_pretrained('xlnet-base-cased', local_files_only=True)
            except Exception:
                return XLNetTokenizer.from_pretrained('xlnet-base-cased')
        if self.bert_name in ['bert-base', 'bert-base-uncased']:
            try:
                return BertTokenizer.from_pretrained('bert-base-uncased', do_lower_case=True, local_files_only=True)
            except Exception:
                return BertTokenizer.from_pretrained('bert-base-uncased', do_lower_case=True)
        if self.bert_name == 'bert-base-chinese':
            try:
                return BertTokenizer.from_pretrained('bert-base-chinese', local_files_only=True)
            except Exception:
                return BertTokenizer.from_pretrained('bert-base-chinese')
        try:
            return AutoTokenizer.from_pretrained(self.bert_name, local_files_only=True)
        except Exception:
            return AutoTokenizer.from_pretrained(self.bert_name)