train_dgg.py

import click as ck
import pandas as pd
from deepgo.utils import Ontology, propagate_annots
import torch as th
import numpy as np
from torch import nn
from torch.nn import functional as F
from torch import optim
import copy
from torch.utils.data import DataLoader, IterableDataset, TensorDataset
from itertools import cycle
import math
from dgl.nn import GraphConv
import dgl
from deepgo.torch_utils import FastTensorDataLoader
import csv
from torch.optim.lr_scheduler import MultiStepLR
from deepgo.data import load_ppi_data
from deepgo.metrics import compute_roc
from multiprocessing import Pool
from functools import partial


@ck.command()
@ck.option(
    '--data-root', '-dr', default='data',
    help='Data folder')
@ck.option(
    '--ont', '-ont', default='mf', type=ck.Choice(['mf', 'bp', 'cc']),
    help='GO subontology')
@ck.option(
    '--test-data-name', '-td', default='test', type=ck.Choice(['test', 'nextprot']),
    help='Test data set name')
@ck.option(
    '--batch-size', '-bs', default=37,
    help='Batch size for training')
@ck.option(
    '--epochs', '-ep', default=256,
    help='Training epochs')
@ck.option(
    '--load', '-ld', is_flag=True, help='Load Model?')
@ck.option(
    '--device', '-d', default='cuda:0',
    help='Device')
def main(data_root, ont, test_data_name, batch_size, epochs, load, device):
    go_file = f'{data_root}/go.obo'
    model_file = f'{data_root}/{ont}/dgg.th'
    terms_file = f'{data_root}/{ont}/terms.pkl'
    out_file = f'{data_root}/{ont}/{test_data_name}_predictions_dgg.pkl'

    go = Ontology(go_file, with_rels=True)

    loss_func = nn.BCELoss()
    features_length = None
    features_column = 'interpros'
    ppi_graph_file = f'ppi_{test_data_name}.bin'    
    test_data_file = f'{test_data_name}_data.pkl'
    iprs_dict, terms_dict, graph, train_nids, valid_nids, test_nids, data, labels, test_df = load_ppi_data(
        data_root, ont, features_length, features_column, test_data_file, ppi_graph_file)
    n_terms = len(terms_dict)
    features_length = len(iprs_dict)

    
    valid_labels = labels[valid_nids].numpy()
    test_labels = labels[test_nids].numpy()

    labels = labels.to(device)

    
    graph = graph.to(device)

    train_nids = train_nids.to(device)
    valid_nids = valid_nids.to(device)
    test_nids = test_nids.to(device)

    net = DeepGraphGOModel(features_length, n_terms, device).to(device)

    sampler = dgl.dataloading.MultiLayerFullNeighborSampler(2)
    train_dataloader = dgl.dataloading.DataLoader(
        graph, train_nids, sampler,
        batch_size=batch_size,
        shuffle=False,
        drop_last=False,
        num_workers=0)

    valid_dataloader = dgl.dataloading.DataLoader(
        graph, valid_nids, sampler,
        batch_size=batch_size,
        shuffle=False,
        drop_last=False,
        num_workers=0)

    test_dataloader = dgl.dataloading.DataLoader(
        graph, test_nids, sampler,
        batch_size=batch_size,
        shuffle=False,
        drop_last=False,
        num_workers=0)
    
    
    optimizer = th.optim.Adam(net.parameters(), lr=1e-3)
    scheduler = MultiStepLR(optimizer, milestones=[1, 3,], gamma=0.1)

    best_loss = 10000.0
    if not load:
        print('Training the model')
        for epoch in range(epochs):
            net.train()
            train_loss = 0
            train_steps = int(math.ceil(len(train_nids) / batch_size))
            with ck.progressbar(length=train_steps, show_pos=True) as bar:
                for input_nodes, output_nodes, blocks in train_dataloader:
                    bar.update(1)
                    logits = net(input_nodes, output_nodes, blocks)
                    batch_labels = labels[output_nodes]
                    loss = F.binary_cross_entropy(logits, batch_labels)
                    optimizer.zero_grad()
                    loss.backward()
                    optimizer.step()
                    train_loss += loss.detach().item()
            
            train_loss /= train_steps
            
            print('Validation')
            net.eval()
            with th.no_grad():
                valid_steps = int(math.ceil(len(valid_nids) / batch_size))
                valid_loss = 0
                preds = []
                with ck.progressbar(length=valid_steps, show_pos=True) as bar:
                    for input_nodes, output_nodes, blocks in valid_dataloader:
                        bar.update(1)
                        logits = net(input_nodes, output_nodes, blocks)
                        batch_labels = labels[output_nodes]
                        batch_loss = F.binary_cross_entropy(logits, batch_labels)
                        valid_loss += batch_loss.detach().item()
                        preds = np.append(preds, logits.detach().cpu().numpy())
                valid_loss /= valid_steps
                roc_auc = compute_roc(valid_labels, preds)
                print(f'Epoch {epoch}: Loss - {train_loss}, Valid loss - {valid_loss}, AUC - {roc_auc}')
            if valid_loss < best_loss:
                best_loss = valid_loss
                print('Saving model')
                th.save(net.state_dict(), model_file)

            scheduler.step()
            
        log_file.close()

    # Loading best model
    print('Loading the best model')
    net.load_state_dict(th.load(model_file))
    net.eval()
    with th.no_grad():
        test_steps = int(math.ceil(len(test_nids) / batch_size))
        test_loss = 0
        preds = []
        with ck.progressbar(length=test_steps, show_pos=True) as bar:
            for input_nodes, output_nodes, blocks in test_dataloader:
                bar.update(1)
                logits = net(input_nodes, output_nodes, blocks)
                batch_labels = labels[output_nodes]
                batch_loss = F.binary_cross_entropy(logits, batch_labels)
                test_loss += batch_loss.detach().cpu().item()
                preds.append(logits.detach().cpu().numpy())
            test_loss /= test_steps
        preds = np.concatenate(preds)
        roc_auc = compute_roc(test_labels, preds)
        print(f'Test Loss - {test_loss}, AUC - {roc_auc}')

    preds = list(preds)
    # Propagate scores using ontology structure
    with Pool(32) as p:
        preds = p.map(partial(propagate_annots, go=go, terms_dict=terms_dict), preds)

    test_df['preds'] = preds

    test_df.to_pickle(out_file)


class MLPBlock(nn.Module):

    def __init__(self, in_features, out_features, bias=True, layer_norm=False, dropout=0.5, activation=nn.ReLU):
        super().__init__()
        self.linear = nn.Linear(in_features, out_features, bias)
        self.activation = activation()
        self.layer_norm = nn.LayerNorm(out_features) if layer_norm else None
        self.dropout = nn.Dropout(dropout) if dropout else None

    def forward(self, x):
        x = self.activation(self.linear(x))
        if self.layer_norm:
            x = self.layer_norm(x)
        if self.dropout:
            x = self.dropout(x)
        return x


class DeepGraphGOModel(nn.Module):

    def __init__(self, nb_iprs, nb_gos, device, hidden_dim=1024):
        super().__init__()
        self.nb_gos = nb_gos
        self.net1 = MLPBlock(nb_iprs, hidden_dim)
        self.conv1 = GraphConv(hidden_dim, hidden_dim)
        self.conv2 = GraphConv(hidden_dim, hidden_dim)
        input_length = hidden_dim
        self.net2 = nn.Sequential(
            nn.Linear(hidden_dim, nb_gos),
            nn.Sigmoid())

        
    def forward(self, input_nodes, output_nodes, blocks, residual=True):
        g1 = blocks[0]
        g2 = blocks[1]
        features = g1.ndata['feat']['_N']
        x = self.net1(features)
        x = self.conv1(g1, x)
        x = self.conv2(g2, x)
        logits = self.net2(x)
        return logits
        
    

if __name__ == '__main__':
    main()