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Dual-Key_Backdoor_Attacks
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# --------------------------------------------------------
# OpenVQA
# Written by Yuhao Cui https://github.com/cuiyuhao1996
# --------------------------------------------------------

import os, json, torch, pickle
import numpy as np
import torch.nn as nn
import torch.utils.data as Data
from openvqa.models.model_loader import ModelLoader
from openvqa.datasets.dataset_loader import EvalLoader


# Evaluation
@torch.no_grad()
def test_engine(__C, dataset, state_dict=None, validation=False):

    # Load parameters
    if __C.CKPT_PATH is not None:
        print('Warning: you are now using CKPT_PATH args, '
              'CKPT_VERSION and CKPT_EPOCH will not work')

        path = __C.CKPT_PATH
    else:
        path = __C.CKPTS_PATH + \
               '/ckpt_' + __C.CKPT_VERSION + \
               '/epoch' + str(__C.CKPT_EPOCH) + '.pkl'

    # val_ckpt_flag = False
    if state_dict is None:
        # val_ckpt_flag = True
        print('Loading ckpt from: {}'.format(path))
        state_dict = torch.load(path)['state_dict']
        print('Finish!')

        if __C.N_GPU > 1:
            state_dict = ckpt_proc(state_dict)

    # Store the prediction list
    # qid_list = [ques['question_id'] for ques in dataset.ques_list]
    ans_ix_list = []
    pred_list = []

    data_size = dataset.data_size
    token_size = dataset.token_size
    ans_size = dataset.ans_size
    pretrained_emb = dataset.pretrained_emb

    net = ModelLoader(__C).Net(
        __C,
        pretrained_emb,
        token_size,
        ans_size
    )
    net.cuda()
    net.eval()

    if __C.N_GPU > 1:
        net = nn.DataParallel(net, device_ids=__C.DEVICES)

    net.load_state_dict(state_dict)

    dataloader = Data.DataLoader(
        dataset,
        batch_size=__C.EVAL_BATCH_SIZE,
        shuffle=False,
        num_workers=__C.NUM_WORKERS,
        pin_memory=__C.PIN_MEM
    )

    for step, (
            frcn_feat_iter,
            grid_feat_iter,
            bbox_feat_iter,
            ques_ix_iter,
            ans_iter
    ) in enumerate(dataloader):

        print("\rEvaluation: [step %4d/%4d]" % (
            step,
            int(data_size / __C.EVAL_BATCH_SIZE),
        ), end='          ')

        frcn_feat_iter = frcn_feat_iter.cuda()
        grid_feat_iter = grid_feat_iter.cuda()
        bbox_feat_iter = bbox_feat_iter.cuda()
        ques_ix_iter = ques_ix_iter.cuda()

        pred = net(
            frcn_feat_iter,
            grid_feat_iter,
            bbox_feat_iter,
            ques_ix_iter
        )
        pred_np = pred.cpu().data.numpy()
        pred_argmax = np.argmax(pred_np, axis=1)

        # Save the answer index
        if pred_argmax.shape[0] != __C.EVAL_BATCH_SIZE:
            pred_argmax = np.pad(
                pred_argmax,
                (0, __C.EVAL_BATCH_SIZE - pred_argmax.shape[0]),
                mode='constant',
                constant_values=-1
            )

        ans_ix_list.append(pred_argmax)

        # Save the whole prediction vector
        if __C.TEST_SAVE_PRED:
            if pred_np.shape[0] != __C.EVAL_BATCH_SIZE:
                pred_np = np.pad(
                    pred_np,
                    ((0, __C.EVAL_BATCH_SIZE - pred_np.shape[0]), (0, 0)),
                    mode='constant',
                    constant_values=-1
                )

            pred_list.append(pred_np)

    print('')
    ans_ix_list = np.array(ans_ix_list).reshape(-1)


    if validation:
        if __C.RUN_MODE not in ['train']:
            result_eval_file = __C.CACHE_PATH + '/result_run_' + __C.CKPT_VERSION
        else:
            result_eval_file = __C.CACHE_PATH + '/result_run_' + __C.VERSION
    else:
        if __C.CKPT_PATH is not None:
            result_eval_file = __C.RESULT_PATH + '/result_run_' + __C.CKPT_VERSION
        else:
            result_eval_file = __C.RESULT_PATH + '/result_run_' + __C.CKPT_VERSION + '_epoch' + str(__C.CKPT_EPOCH)


    if __C.CKPT_PATH is not None:
        ensemble_file = __C.PRED_PATH + '/result_run_' + __C.CKPT_VERSION + '.pkl'
    else:
        ensemble_file = __C.PRED_PATH + '/result_run_' + __C.CKPT_VERSION + '_epoch' + str(__C.CKPT_EPOCH) + '.pkl'


    if __C.RUN_MODE not in ['train']:
        log_file = __C.LOG_PATH + '/log_run_' + __C.CKPT_VERSION + '.txt'
    else:
        log_file = __C.LOG_PATH + '/log_run_' + __C.VERSION + '.txt'

    EvalLoader(__C).eval(dataset, ans_ix_list, pred_list, result_eval_file, ensemble_file, log_file, validation)


def ckpt_proc(state_dict):
    state_dict_new = {}
    for key in state_dict:
        state_dict_new['module.' + key] = state_dict[key]
        # state_dict.pop(key)

    return state_dict_new