[ torch 参数更多 ]torch.nn.functional.nll_loss¶
torch.nn.functional.nll_loss¶
torch.nn.functional.nll_loss(input,
target,
weight=None,
size_average=None,
ignore_index=- 100,
reduce=None,
reduction='mean')
paddle.nn.functional.nll_loss¶
paddle.nn.functional.nll_loss(input,
label,
weight=None,
ignore_index=-100,
reduction='mean',
name=None)
其中 PyTorch 相⽐ Paddle ⽀持更多其他参数,具体如下:
参数映射¶
PyTorch | PaddlePaddle | 备注 |
---|---|---|
input | input | 输入 Tensor |
target | label | 输入 Tensor 对应的标签值,仅参数名不一致。 |
size_average | - | 已弃用 |
weight | weight | 手动指定每个类别的权重 |
ignore_index | ignore_index | 指定一个忽略的标签值,此标签值不参与计算 |
reduce | - | 已弃用 |
reduction | reduction | 表示应用于输出结果的规约方式,可选值有:'none', 'mean', 'sum' |
转写示例¶
# PyTorch 的 size_average、 reduce 参数转为 Paddle 的 reduction 参数
if size_average is None:
size_average = True
if reduce is None:
reduce = True
if size_average and reduce:
reduction = 'mean'
elif reduce:
reduction = 'sum'
else:
reduction = 'none'