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ComputationGraph

ComputationGraph(API) is the basic computation model class. All other computation model are based on this class.

Forward

A typical forward computation with ComputationGraph like below:

let g = ComputationGraph()

/// Add input and operators
/// ...

/// This only needs to be called before 1st forward
g.forwardPrepare()

let results = g.forward()

Below figure illustrates the forward process in ComputationGraph:

Forward Process

ComputationGraph and ForwardGraph

In ComputationGraph forward computation, Serrano does not do any memory optimization. Because a ComputationGraph stores all inner results for each operator's output.

If you want to use less memory and only cares about a forward computation's final results, you can use ForwardGraph(API). Check guide here.