Merging 3 regression model at certain ratio

Hi! everyone
I am currently working on a problem where i have 3 trained regression model, where each model gives output of (1,300) length sequence. things i need to do is combine the output from the regression model at certain ratio ax + by + c*z = final output (1,300). I want to train the ratio a,b,c. I don’t want the gradient to back propagate to the trained model only the ratio must be updated. suggest me how can i achieve this.

I’d you want to keep the models frozen and only train the scaling factors, initialize them as nn.Parameters, pass them to an optimizer, and update them in each iteration.

did you mean like this ?

class combined_model(nn.Module):
    def __init__(self):
        self.a = nn.Parameter(torch.tensor(1.0))
        self.b = nn.Parameter(torch.tensor(1.0))
        self.c = nn.Parameter(torch.tensor(1.0))

    def forward(self,x1,x2,x3):
        return self.a*x1+self.b*x2+self.c*x3

Yes, your approach looks valid.