How many layers can be active at a time?

Answer 1

The number of active layers that can be used simultaneously depends on the context, such as the type of software or system being referenced. In graphic design software like Adobe Photoshop, you can have multiple layers active, but typically only one can be edited at a time. In machine learning models, especially in neural networks, multiple layers are active during the forward and backward passes, but the number of layers calculated simultaneously is defined by the architecture of the model.