main_bspan.py

import argparse
import time
import math
import numpy as np
import torch
import torch.nn as nn

import tcn_bi as tcn
import data
import model

from utils import batchify, get_batch, repackage_hidden

parser = argparse.ArgumentParser(description='PyTorch PennTreeBank RNN/LSTM Language Model')
parser.add_argument('--data', type=str, default='data/penn/',
                    help='location of the data corpus')
parser.add_argument('--model', type=str, default='LSTM',
                    help='type of recurrent net (LSTM, QRNN, GRU)')
parser.add_argument('--emsize', type=int, default=400,
                    help='size of word embeddings')
parser.add_argument('--nhid', type=int, default=1150,
                    help='number of hidden units per layer')
parser.add_argument('--nlayers', type=int, default=3,
                    help='number of layers')
parser.add_argument('--lr', type=float, default=30,
                    help='initial learning rate')
parser.add_argument('--clip', type=float, default=0.25,
                    help='gradient clipping')
parser.add_argument('--epochs', type=int, default=8000,
                    help='upper epoch limit')
parser.add_argument('--batch_size', type=int, default=80, metavar='N',
                    help='batch size')
parser.add_argument('--bptt', type=int, default=70,
                    help='sequence length')
parser.add_argument('--dropout', type=float, default=0.4,
                    help='dropout applied to layers (0 = no dropout)')
parser.add_argument('--dropouth', type=float, default=0.3,
                    help='dropout for rnn layers (0 = no dropout)')
parser.add_argument('--dropouti', type=float, default=0.65,
                    help='dropout for input embedding layers (0 = no dropout)')
parser.add_argument('--dropoute', type=float, default=0.1,
                    help='dropout to remove words from embedding layer (0 = no dropout)')
parser.add_argument('--wdrop', type=float, default=0.5,
                    help='amount of weight dropout to apply to the RNN hidden to hidden matrix')
parser.add_argument('--seed', type=int, default=1111,
                    help='random seed')
parser.add_argument('--nonmono', type=int, default=5,
                    help='random seed')
parser.add_argument('--ns', action='store_false',
                    help='negative sampling')
parser.add_argument('--cuda', action='store_false',
                    help='use CUDA')
parser.add_argument('--log-interval', type=int, default=200, metavar='N',
                    help='report interval')
randomhash = ''.join(str(time.time()).split('.'))
parser.add_argument('--save', type=str,  default=randomhash+'.pt',
                    help='path to save the final model')
parser.add_argument('--theta', type=float, default=.1,
                    help='theta makes the model learn skip-word dependency in decoding (theta = 0 means no regularization)')
parser.add_argument('--alpha', type=float, default=2,
                    help='alpha L2 regularization on RNN activation (alpha = 0 means no regularization)')
parser.add_argument('--beta', type=float, default=1,
                    help='beta slowness regularization applied on RNN activiation (beta = 0 means no regularization)')
parser.add_argument('--wdecay', type=float, default=1.2e-6,
                    help='weight decay applied to all weights')
parser.add_argument('--resume', type=str,  default='',
                    help='path of model to resume')
parser.add_argument('--optimizer', type=str,  default='sgd',
                    help='optimizer to use (sgd, adam)')
parser.add_argument('--when', nargs="+", type=int, default=[-1],
                    help='When (which epochs) to divide the learning rate by 10 - accepts multiple')
args = parser.parse_args()
args.tied = True

# Set the random seed manually for reproducibility.
np.random.seed(args.seed)
torch.manual_seed(args.seed)
if torch.cuda.is_available():
    if not args.cuda:
        print("WARNING: You have a CUDA device, so you should probably run with --cuda")
    else:
        torch.cuda.manual_seed(args.seed)

###############################################################################
# Load data
###############################################################################

def model_save(fn):
    with open('models/{}'.format(fn), 'wb') as f:
        torch.save([model_lm, model_r, model_mlp, criterion, optimizer], f)

def model_load(fn):
    global model_lm, criterion, optimizer
    with open('models/{}'.format(fn), 'rb') as f:
        model_lm, model_r, model_mlp, criterion, optimizer = torch.load(f)

import os
import hashlib
fn = 'corpus.{}.data'.format(hashlib.md5(args.data.encode()).hexdigest())
if os.path.exists(fn):
    print('Loading cached dataset...')
    corpus = torch.load(fn)
else:
    print('Producing dataset...')
    corpus = data.Corpus(args.data)
    torch.save(corpus, fn)

eval_batch_size = 10
test_batch_size = 1
train_data = batchify(corpus.train, args.batch_size, args)
val_data = batchify(corpus.valid, eval_batch_size, args)
test_data = batchify(corpus.test, test_batch_size, args)

###############################################################################
# Build the model
###############################################################################

from splitcross import SplitCrossEntropyLoss
criterion = None

ntokens = len(corpus.dictionary)
model_lm = model.RNNModel(args.model, ntokens, args.emsize, args.nhid, args.nlayers, args.dropout, args.dropouth, args.dropouti, args.dropoute, args.wdrop, args.tied)
model_r = tcn.TCN(args.emsize, args.nhid, 5, 1, 1)

model_mlp = nn.Sequential(
        # nn.Dropout(0.5),
        nn.Linear(args.emsize, args.nhid),
        # nn.LayerNorm(args.nhid),
        # nn.Tanh(),
        nn.Dropout(0.5),
        # nn.Linear(args.nhid, args.nhid),
        # nn.ReLU()
    )

# span_dropout = nn.Dropout(0.4).cuda()
# model_r = model.RNNModel(args.model, ntokens, args.emsize, args.nhid, args.nlayers, args.dropout, args.dropouth, args.dropouti, args.dropoute, args.wdrop, args.tied)
###
if args.resume:
    print('Resuming model ...')
    model_load(args.resume)
    optimizer.param_groups[0]['lr'] = args.lr
    model.dropouti, model.dropouth, model.dropout, args.dropoute = args.dropouti, args.dropouth, args.dropout, args.dropoute
    if args.wdrop:
        from weight_drop import WeightDrop
        for rnn in model.rnns:
            if type(rnn) == WeightDrop: rnn.dropout = args.wdrop
            elif rnn.zoneout > 0: rnn.zoneout = args.wdrop
###
if not criterion:
    splits = []
    if ntokens > 500000:
        # One Billion
        # This produces fairly even matrix mults for the buckets:
        # 0: 11723136, 1: 10854630, 2: 11270961, 3: 11219422
        splits = [4200, 35000, 180000]
    elif ntokens > 75000:
        # WikiText-103
        splits = [2800, 20000, 76000]
    print('Using', splits)
    criterion = SplitCrossEntropyLoss(args.emsize, splits=splits, verbose=False)
###
if args.cuda:
    model_lm = model_lm.cuda()
    model_r = model_r.cuda()
    model_mlp = model_mlp.cuda()
    criterion = criterion.cuda()
###
params = list(model_lm.parameters()) + list(model_r.parameters()) + list(model_mlp.parameters()) + list(criterion.parameters())
params_enc = list(model_lm.parameters()) + list(criterion.parameters())
total_params = sum(x.size()[0] * x.size()[1] if len(x.size()) > 1 else x.size()[0] for x in params_enc if x.size())
print('Args:', args)
print('Model total parameters:', total_params)

###############################################################################
# Training code
###############################################################################

def evaluate(data_source, batch_size=10):
    # Turn on evaluation mode which disables dropout.
    model_lm.eval()
    # model_mlp.eval()
    if args.model == 'QRNN': model_lm.reset()
    total_loss = 0
    ntokens = len(corpus.dictionary)
    hidden = model_lm.init_hidden(batch_size)
    for i in range(0, data_source.size(0) - 1, args.bptt):
        data, targets, _ = get_batch(data_source, i, args, evaluation=True)
        output, hidden, _, all_outputs = model_lm(data, hidden, return_h=True)
        # output = model_mlp(all_outputs[-1]) + all_outputs[-1]
        # output = output.view(output.size(0)*output.size(1), output.size(2))
        total_loss += len(data) * criterion(model_lm.decoder.weight, model_lm.decoder.bias, output, targets).data
        hidden = repackage_hidden(hidden)
    return total_loss.item() / len(data_source)


def train():
    # Turn on training mode which enables dropout.
    if args.model == 'QRNN': model.reset()
    total_loss = 0
    start_time = time.time()
    ntokens = len(corpus.dictionary)
    hidden = model_lm.init_hidden(args.batch_size)
    # hidden_r = model_r.init_hidden(args.batch_size)
    batch, i = 0, 0
    while i < train_data.size(0) - 1 - 1:
        bptt = args.bptt if np.random.random() < 0.95 else args.bptt / 2.
        # Prevent excessively small or negative sequence lengths
        seq_len = max(5, int(np.random.normal(bptt, 5)))
        # There's a very small chance that it could select a very long sequence length resulting in OOM
        # seq_len = min(seq_len, args.bptt + 10)

        lr2 = optimizer.param_groups[0]['lr']
        optimizer.param_groups[0]['lr'] = lr2 * seq_len / args.bptt
        model_lm.train()
        model_r.train()
        model_mlp.train()
        data, targets, targets_r = get_batch(train_data, i, args, seq_len=seq_len)
        # data_long, _, _ = get_batch(train_data, i, args, seq_len=seq_len + 10)

        seq_len_data = data.size(0)
        # data_r = data.flip([0])
        # targets_r = targets_r.flip([0])

        # Starting each batch, we detach the hidden state from how it was previously produced.
        # If we didn't, the model would try backpropagating all the way to start of the dataset.
        hidden = repackage_hidden(hidden)
        # hidden_r = model_r.init_hidden(args.batch_size)
        optimizer.zero_grad()

        output, hidden, rnn_hs, dropped_rnn_hs = model_lm(data, hidden, return_h=True)
        
        input_emb = model_lm.encoder(data)
        # input_emb = model_lm.encoder(data).detach()
        # input_emb = model_lm.encoder(data_long)
        # input_emb = model_lm.encoder(data_long).detach()

        # input_emb_nhid = model_mlp(input_emb)
        
        attention_p, attention_c, seq_len_data, reg_len = model_r(input_emb, seq_len_data)
        span_emb = (input_emb.unsqueeze(0) * attention_p).sum(1)
        # span_emb = (input_emb_nhid.unsqueeze(0) * attention).sum(1)
        
        # output = model_mlp(dropped_rnn_hs[-1]) + dropped_rnn_hs[-1]
        # output = output.view(output.size(0)*output.size(1), output.size(2))

        span_emb = model_mlp(span_emb)# + span_emb
        
        raw_loss = criterion(model_lm.decoder.weight, model_lm.decoder.bias, output, targets)
        # if i != 0: raw_loss += criterion(model_r.decoder.weight, model_r.decoder.bias, output_r, targets_r)
        # if i != 0: raw_loss += 0 * criterion(model_r.decoder.weight, modoyel_r.decoder.bias, output_r, targets_r)

        loss = raw_loss
        # Activiation Regularization
        if args.alpha: loss = loss + sum(args.alpha * dropped_rnn_h.pow(2).mean() for dropped_rnn_h in dropped_rnn_hs[-1:])
        # if args.alpha: loss = loss + sum(args.alpha * dropped_rnn_h.pow(2).mean() for dropped_rnn_h in dropped_rnn_hs_r[-1:])
        # Temporal Activation Regularization (slowness)
        if args.beta: loss = loss + sum(args.beta * (rnn_h[1:] - rnn_h[:-1]).pow(2).mean() for rnn_h in rnn_hs[-1:])
        # if args.beta: loss = loss + sum(args.beta * (rnn_h[:-1] - rnn_h[1:]).pow(2).mean() for rnn_h in rnn_hs_r[-1:])
        
        # loss = loss + args.theta * (dropped_rnn_hs[-1] - span_emb).pow(2).mean()
        # '''
        # args.ns = False
        context_emb = (dropped_rnn_hs[-2].unsqueeze(0) * attention_c).sum(1)
        # context_emb = dropped_rnn_hs[-2].detach()
        if args.ns:
            span_emb_t = span_emb.transpose(0, 1)
            pos_loss = (1 - (context_emb * span_emb).sum(2).sigmoid()).mean()
            neg_loss = 0

            split_idx_batch = int(torch.randint(args.batch_size, []))
            # split_idx_batch = int(torch.randint(1, args.batch_size, []))
            least_ns_seq = 0
            if split_idx_batch == 0:
                least_ns_seq = 10 if data.size(0) > 15 else int(data.size(0) / 2)
            split_idx_seq = int(torch.randint(least_ns_seq, data.size(0), []))
            
            for j in range(1):
                span_emb_neg = torch.cat([span_emb_t[split_idx_batch:], span_emb_t[:split_idx_batch]], 0).transpose(0, 1)
                span_emb_neg = torch.cat([span_emb_neg[split_idx_seq:], span_emb_neg[:split_idx_seq]], 0)
                neg_loss += (context_emb * span_emb_neg).sum(2).sigmoid().mean()
                
                # split_idx_batch = int(torch.randint(args.batch_size, []))
                # split_idx_batch = int(torch.randint(1, args.batch_size, []))
                # least_ns_seq = 0
                # if split_idx_batch == 0:
                #     least_ns_seq = 10 if data.size(0) > 15 else int(data.size(0) / 2)
                # split_idx_seq = int(torch.randint(least_ns_seq, data.size(0), []))
                # print(attention.squeeze())
                # print(neg_loss)
                # print('x' + 1)
                # data_neg, _, _ = get_batch(train_data, split_idx_batch, args, seq_len = data.size(0))
                # input_emb_neg = model_lm.encoder(data_neg)
                # attention_neg = model_r(input_emb_neg)
                # span_emb_neg = (input_emb_neg.unsqueeze(0) * attention_neg).sum(1)
                # span_emb_neg = model_mlp(span_emb_neg)
                # neg_loss += (dropped_rnn_hs[-2] * span_emb_neg).sum(2).sigmoid().mean()
                # split_idx_batch = int(torch.randint(train_data.size(0) - data.size(0), []))
            
            # loss += 0
            # loss += args.theta * (pos_loss + neg_loss)
            loss += args.theta * (pos_loss + neg_loss) # + 0.1 * reg_len
            # split_idx_seq = (split_idx_seq * 7) % args.bptt
        else:
            loss = loss + args.theta * (context_emb - span_emb).pow(2).mean()
        # '''
        # print(attention.mean(2).mean(2))
        # loss += (attention > 0).float().sum() * 0.05
        loss.backward()

        # `clip_grad_norm` helps prevent the exploding gradient problem in RNNs / LSTMs.
        if args.clip: torch.nn.utils.clip_grad_norm_(params, args.clip)
        optimizer.step()

        total_loss += raw_loss.data
        optimizer.param_groups[0]['lr'] = lr2
        if batch % args.log_interval == 0 and batch > 0:
            cur_loss = total_loss.item() / args.log_interval
            elapsed = time.time() - start_time
            print('| epoch {:3d} | {:5d}/{:5d} batches | lr {:05.5f} | ms/batch {:5.2f} | '
                    'loss {:5.2f} | ppl {:8.2f} | bpc {:8.3f}'.format(
                epoch, batch, len(train_data) // args.bptt, optimizer.param_groups[0]['lr'],
                elapsed * 1000 / args.log_interval, cur_loss, math.exp(cur_loss), cur_loss / math.log(2)))
            total_loss = 0
            start_time = time.time()
        ###
        batch += 1
        i += seq_len

# Loop over epochs.
lr = args.lr
best_val_loss = []
stored_loss = 100000000

# At any point you can hit Ctrl + C to break out of training early.
try:
    optimizer = None
    # Ensure the optimizer is optimizing params, which includes both the model's weights as well as the criterion's weight (i.e. Adaptive Softmax)
    if args.optimizer == 'sgd':
        optimizer = torch.optim.SGD(params, lr=args.lr, weight_decay=args.wdecay)
    if args.optimizer == 'adam':
        optimizer = torch.optim.Adam(params, lr=args.lr, weight_decay=args.wdecay)
    for epoch in range(1, args.epochs+1):
        epoch_start_time = time.time()
        train()
        if 't0' in optimizer.param_groups[0]:
            tmp = {}
            for prm in list(model_lm.parameters()) + list(model_r.parameters()) + list(model_mlp.parameters()):
                tmp[prm] = prm.data.clone()
                # print(prm.size())
                prm.data = optimizer.state[prm]['ax'].clone()

            val_loss2 = evaluate(val_data)
            print('-' * 89)
            print('| end of epoch {:3d} | time: {:5.2f}s | valid loss {:5.2f} | '
                'valid ppl {:8.2f} | valid bpc {:8.3f} | model {}'.format(
                    epoch, (time.time() - epoch_start_time), val_loss2, math.exp(val_loss2), val_loss2 / math.log(2), args.save))
            print('-' * 89)

            if val_loss2 < stored_loss:
                model_save(args.save)
                print('Saving Averaged!')
                stored_loss = val_loss2

            for prm in list(model_lm.parameters()) + list(model_r.parameters()) + list(model_mlp.parameters()):
                prm.data = tmp[prm].clone()

        else:
            val_loss = evaluate(val_data, eval_batch_size)
            print('-' * 89)
            print('| end of epoch {:3d} | time: {:5.2f}s | valid loss {:5.2f} | '
                'valid ppl {:8.2f} | valid bpc {:8.3f} | model {}'.format(
              epoch, (time.time() - epoch_start_time), val_loss, math.exp(val_loss), val_loss / math.log(2), args.save))
            print('-' * 89)

            if val_loss < stored_loss:
                model_save(args.save)
                print('Saving model (new best validation)')
                stored_loss = val_loss

            if args.optimizer == 'sgd' and 't0' not in optimizer.param_groups[0] and (len(best_val_loss)>args.nonmono and val_loss > min(best_val_loss[:-args.nonmono])):
                print('Switching to ASGD')
                optimizer = torch.optim.ASGD(list(model_lm.parameters()) + list(model_r.parameters()) + list(model_mlp.parameters()),
                        lr=args.lr, t0=0, lambd=0., weight_decay=args.wdecay)

            if epoch in args.when:
                print('Saving model before learning rate decreased')
                model_save('{}.e{}'.format(args.save, epoch))
                print('Dividing learning rate by 10')
                optimizer.param_groups[0]['lr'] /= 10.

            best_val_loss.append(val_loss)

except KeyboardInterrupt:
    print('-' * 89)
    print('Exiting from training early')

# Load the best saved model.
model_load(args.save)

# Run on test data.
test_loss = evaluate(test_data, test_batch_size)
print('=' * 89)
print('| End of training | test loss {:5.2f} | test ppl {:8.2f} | test bpc {:8.3f}'.format(
    test_loss, math.exp(test_loss), test_loss / math.log(2)))
print('=' * 89)