# Copyright (c) OpenMMLab. All rights reserved.
import torch

from mmseg.models.decode_heads import EMAHead
from .utils import to_cuda


def test_emanet_head():
    head = EMAHead(
        in_channels=4,
        ema_channels=3,
        channels=2,
        num_stages=3,
        num_bases=2,
        num_classes=19)
    for param in head.ema_mid_conv.parameters():
        assert not param.requires_grad
    assert hasattr(head, 'ema_module')
    inputs = [torch.randn(1, 4, 23, 23)]
    if torch.cuda.is_available():
        head, inputs = to_cuda(head, inputs)
    outputs = head(inputs)
    assert outputs.shape == (1, head.num_classes, 23, 23)