NetFoldOperator
NetFoldOperator[net] represents a net in which net is folded over a sequence of inputs, maintaining a recurrent state.
NetFoldOperator[net,{outi->in1,…}] represents a net in which net is folded over its inputs, maintaining a recurrent state by feeding the outi of each step back to the ini of the next step.
NetFoldOperator[net,feedback,{const1,const2,…}] treats the inputs consti to net as being constant instead of mapped over.
NetFoldOperator[net,feedback,constants,{out1,…}] returns the sequence of values for the specific outputs outi.
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