Multiple inputs data for the MIONet model.

[Nhatkhang]

Hi all,
I am trying to create a multiple input DeepONet, i.e. MIONet model, with 3+ branch net. To build a model, the data object needs to be created first. However, as I follow the readthedocs manual and the MIONet paper, it only offers up to quadruple data, deepxde.data.quadruple, or 2 branch nets only. So let say, I have an array size (N_b, dim_1) as input for branch net1, size (N_b, dim_1) as input for branch net2, ..., and so on, so in the end, it will be end up with M branch nets with the same size (N_b, dim1). The trunk net will have the size of (N_t,dim2). My output will have the size of (N_b, N_t). Could you please guide me how I can create a data object in this case.
Thank you in advance.

[lululxvi]

You need to create a new class similar to MIONet, but with more branches.

[Nhatkhang]

Thank you for your response. I have a follow-up question regarding DeepONet. Can it handle a 2D input function? For instance, in my current setup, the input for the branch network has a shape of (Nf, Nt), where Nf represents the number of functions (extracted from the function space) and Nt corresponds to the number of time stamps.

Now, suppose I want to input a 2D spatial distribution function, which would have a shape of (2, Nt). In this case, the input for the branch network would take the form (Nf, 2, Nt). However, when I attempted to fit this input into the original branch network, I encountered a shape mismatch error.

Could you provide guidance on how to address this issue?

[lululxvi]

You can find some examples at https://github.com/lu-group/