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# Copyright (c) OpenMMLab. All rights reserved.
from copy import deepcopy

import pytest
import torch

from mmgen.models.architectures import IDLossModel
# yapf:disable
from mmgen.models.architectures.arcface.model_irse import Backbone

# yapf:enable


class TestArcFace:

    @classmethod
    def setup_class(cls):
        cls.default_cfg = dict(
            input_size=224,
            num_layers=50,
            mode='ir',
            drop_ratio=0.4,
            affine=True)

    def test_arcface_cpu(self):
        model = Backbone(**self.default_cfg)
        x = torch.randn((2, 3, 224, 224))
        y = model(x)
        assert y.shape == (2, 512)

        # test different input size
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(input_size=112))
        model = Backbone(**cfg)
        x = torch.randn((2, 3, 112, 112))
        y = model(x)
        assert y.shape == (2, 512)

        # test different num_layers
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(num_layers=50))
        model = Backbone(**cfg)
        x = torch.randn((2, 3, 224, 224))
        y = model(x)
        assert y.shape == (2, 512)

        # test different mode
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(mode='ir_se'))
        model = Backbone(**cfg)
        x = torch.randn((2, 3, 224, 224))
        y = model(x)
        assert y.shape == (2, 512)

        # test different drop ratio
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(drop_ratio=0.8))
        model = Backbone(**cfg)
        x = torch.randn((2, 3, 224, 224))
        y = model(x)
        assert y.shape == (2, 512)

        # test affine=False
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(affine=False))
        model = Backbone(**cfg)
        x = torch.randn((2, 3, 224, 224))
        y = model(x)
        assert y.shape == (2, 512)

    @pytest.mark.skipif(not torch.cuda.is_available(), reason='requires cuda')
    def test_arcface_cuda(self):
        model = Backbone(**self.default_cfg).cuda()
        x = torch.randn((2, 3, 224, 224)).cuda()
        y = model(x)
        assert y.shape == (2, 512)

        # test different input size
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(input_size=112))
        model = Backbone(**cfg).cuda()
        x = torch.randn((2, 3, 112, 112)).cuda()
        y = model(x)
        assert y.shape == (2, 512)

        # test different num_layers
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(num_layers=50))
        model = Backbone(**cfg).cuda()
        x = torch.randn((2, 3, 224, 224)).cuda()
        y = model(x)
        assert y.shape == (2, 512)

        # test different mode
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(mode='ir_se'))
        model = Backbone(**cfg).cuda()
        x = torch.randn((2, 3, 224, 224)).cuda()
        y = model(x)
        assert y.shape == (2, 512)

        # test different drop ratio
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(drop_ratio=0.8))
        model = Backbone(**cfg).cuda()
        x = torch.randn((2, 3, 224, 224)).cuda()
        y = model(x)
        assert y.shape == (2, 512)

        # test affine=False
        cfg = deepcopy(self.default_cfg)
        cfg.update(dict(affine=False))
        model = Backbone(**cfg).cuda()
        x = torch.randn((2, 3, 224, 224)).cuda()
        y = model(x)
        assert y.shape == (2, 512)

        # test loss model
        id_loss_model = IDLossModel()
        x1 = torch.randn((2, 3, 224, 224)).cuda()
        x2 = torch.randn((2, 3, 224, 224)).cuda()
        y, _ = id_loss_model(pred=x1, gt=x2)
        assert y >= 0