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# Copyright (c) OpenMMLab. All rights reserved.
from typing import Optional
import torch
import torch.nn as nn
from torch import Tensor
from mmdet.registry import MODELS
from .utils import weighted_loss
@weighted_loss
def smooth_l1_loss(pred: Tensor, target: Tensor, beta: float = 1.0) -> Tensor:
"""Smooth L1 loss.
Args:
pred (Tensor): The prediction.
target (Tensor): The learning target of the prediction.
beta (float, optional): The threshold in the piecewise function.
Defaults to 1.0.
Returns:
Tensor: Calculated loss
"""
assert beta > 0
if target.numel() == 0:
return pred.sum() * 0
assert pred.size() == target.size()
diff = torch.abs(pred - target)
loss = torch.where(diff < beta, 0.5 * diff * diff / beta,
diff - 0.5 * beta)
return loss
@weighted_loss
def l1_loss(pred: Tensor, target: Tensor) -> Tensor:
"""L1 loss.
Args:
pred (Tensor): The prediction.
target (Tensor): The learning target of the prediction.
Returns:
Tensor: Calculated loss
"""
if target.numel() == 0:
return pred.sum() * 0
assert pred.size() == target.size()
loss = torch.abs(pred - target)
return loss
@MODELS.register_module()
class SmoothL1Loss(nn.Module):
"""Smooth L1 loss.
Args:
beta (float, optional): The threshold in the piecewise function.
Defaults to 1.0.
reduction (str, optional): The method to reduce the loss.
Options are "none", "mean" and "sum". Defaults to "mean".
loss_weight (float, optional): The weight of loss.
"""
def __init__(self,
beta: float = 1.0,
reduction: str = 'mean',
loss_weight: float = 1.0) -> None:
super().__init__()
self.beta = beta
self.reduction = reduction
self.loss_weight = loss_weight
def forward(self,
pred: Tensor,
target: Tensor,
weight: Optional[Tensor] = None,
avg_factor: Optional[int] = None,
reduction_override: Optional[str] = None,
**kwargs) -> Tensor:
"""Forward function.
Args:
pred (Tensor): The prediction.
target (Tensor): The learning target of the prediction.
weight (Tensor, optional): The weight of loss for each
prediction. Defaults to None.
avg_factor (int, optional): Average factor that is used to average
the loss. Defaults to None.
reduction_override (str, optional): The reduction method used to
override the original reduction method of the loss.
Defaults to None.
Returns:
Tensor: Calculated loss
"""
assert reduction_override in (None, 'none', 'mean', 'sum')
reduction = (
reduction_override if reduction_override else self.reduction)
loss_bbox = self.loss_weight * smooth_l1_loss(
pred,
target,
weight,
beta=self.beta,
reduction=reduction,
avg_factor=avg_factor,
**kwargs)
return loss_bbox
@MODELS.register_module()
class L1Loss(nn.Module):
"""L1 loss.
Args:
reduction (str, optional): The method to reduce the loss.
Options are "none", "mean" and "sum".
loss_weight (float, optional): The weight of loss.
"""
def __init__(self,
reduction: str = 'mean',
loss_weight: float = 1.0) -> None:
super().__init__()
self.reduction = reduction
self.loss_weight = loss_weight
def forward(self,
pred: Tensor,
target: Tensor,
weight: Optional[Tensor] = None,
avg_factor: Optional[int] = None,
reduction_override: Optional[str] = None) -> Tensor:
"""Forward function.
Args:
pred (Tensor): The prediction.
target (Tensor): The learning target of the prediction.
weight (Tensor, optional): The weight of loss for each
prediction. Defaults to None.
avg_factor (int, optional): Average factor that is used to average
the loss. Defaults to None.
reduction_override (str, optional): The reduction method used to
override the original reduction method of the loss.
Defaults to None.
Returns:
Tensor: Calculated loss
"""
assert reduction_override in (None, 'none', 'mean', 'sum')
reduction = (
reduction_override if reduction_override else self.reduction)
loss_bbox = self.loss_weight * l1_loss(
pred, target, weight, reduction=reduction, avg_factor=avg_factor)
return loss_bbox
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