64 lines
1.8 KiB
Python
64 lines
1.8 KiB
Python
from typing import Any, Dict, Tuple
|
|
import torch
|
|
import torch.nn as nn
|
|
|
|
|
|
class PtnBCELoss:
|
|
"""
|
|
Ptn BCE Loss:
|
|
A class to compute the binary cross entropy loss.
|
|
|
|
Unlike the Ptn BCE Loss With Logits node, which takes logits as input, this node expects probabilities. If the input consists of logits, apply a Sigmoid function first or use the Ptn BCE Loss With Logits node instead.
|
|
|
|
Args:
|
|
reduction (str): Reduction method.
|
|
`none`: no reduction will be applied done.
|
|
`mean`: computes the mean.
|
|
`sum`: computes the sum.
|
|
|
|
|
|
category: PyTorch wrapper - Loss function
|
|
"""
|
|
|
|
@classmethod
|
|
def INPUT_TYPES(cls) -> Dict[str, Any]:
|
|
"""
|
|
Defines the input types for the function.
|
|
|
|
Returns:
|
|
Dict[str, Any]: A dictionary specifying required input types.
|
|
"""
|
|
return {
|
|
"required": {
|
|
"reduction": (("mean", "sum", "none"),)
|
|
}
|
|
}
|
|
|
|
RETURN_TYPES: Tuple[str] = ("PTLOSS",)
|
|
FUNCTION: str = "f"
|
|
CATEGORY: str = "Training"
|
|
|
|
@classmethod
|
|
def IS_CHANGED(cls, **kw):
|
|
return float("NaN")
|
|
|
|
def f(self,
|
|
reduction: str
|
|
) -> Tuple[nn.Module]:
|
|
"""
|
|
A model to compute the cross entropy loss.
|
|
|
|
Args:
|
|
reduction: (str): Reduction method.
|
|
`none`: no reduction will be applied done.
|
|
`sum`: computes the sum.
|
|
`mean`: computes the mean.
|
|
|
|
Returns:
|
|
Tuple[nn.Module]: A tuple containing the instantiated PyTorch model.
|
|
"""
|
|
with torch.inference_mode(False):
|
|
model = nn.BCELoss(reduction=reduction)
|
|
|
|
return (model,)
|