Function: buildChannelActivations()
buildChannelActivations(
activeChannels):NTCActivation[]
Flattens an (offset-assigned) active-channel layout - see layoutChannels
- into a per-output-component
activationarray, e.g. forNTCTrainer'schannelActivationsoption (see NTCGPUComputeTSL.js) and forNTCNodeMaterial'ssliceChannels/applyChannelActivationat inference time - both index this the same waylayoutChannelsassigns offsets, so a component's activation always lands at the same flat index its value does.