I don't understand the meaning of NMF decoder

[bboyfx]

Hello there! First of all, thank you for sharing your code, and I must say that your work is impressive.
May I ask if you used the decode method or the NMF (multiplying the basis matrix matrix with the weight matrix) for data reconstruction? I don't quite understand what "NMF decoder" means in "Stephen D. Mague et al., Neuron, 2022 - Figure 1D". Could you help me with this? If you could share some more information about the method you used, I would greatly appreciate it. Thank you so much in advance!