I’m attempting to do a sequence CNN for a simple regression. I am wondering about the process of doing so.
I isolated a single datapoint, and changed it’s dimensions to accomodate the future model ( to also work with batches). e.g. my sequences are 35 length so i pass in a [1,1,35] TO DEBUG my network as I add layers I add the layer to my model class’s init then include it in the forward() call.
This works for the following code…
‘’’
class myCNN(torch.nn.Module):
def init(self):
super(myCNN, self).init()
    self.conv1d = torch.nn.Conv1d(in_channels=1, out_channels=8,kernel_size=2)
    self.norm = torch.nn.BatchNorm1d(8)
    self.relu = torch.nn.ReLU()
    self.pool = torch.nn.MaxPool1d(kernel_size=2)
    
    self.fc1 = torch.nn.Linear(136,1) #136 is correct for a SINGLE data point
    
def forward(self,x):
    #reshape x
    x = x.unsqueeze(1) #adds necessary dimension for Conv1D
    x = self.conv1d(x)
    x = self.norm(x)
    x = self.relu(x)
    x = self.pool(x)
    x = x.view(-1) # this flattens the layer
    x = self.fc1(x)
    
    return x

‘’’
However, as you can see I hardcoded the exact size in the self.fc1() layer. This is size for a single data point. When I change my batch size, it increases accordingly.
My questions are


Do I need to pass batch_size in the init() call.


shouldn’t there be a way to make it flexible to batch size, whether it is 1 or 128… this was possible with my linear models.


how can I put in the correct size to the input_dimension for the linear layer?


Second question; I’m trying to replicate models that do stacks of Convolutions/Pooling.
I’m still looking for an example that demonstrates how this is done. It seems like I need to know the number of channels after each conv/pooling block to pass into the following block. How can I do this without hardcoding these values?
I hope this makes sense!
thanks