add learn()

src/IronpenGPU.jl

@@ -1,4 +1,4 @@
-module IronpenGPU
+module IronpenGPU   # this is a parent module
 
 # export 
 
@@ -8,7 +8,7 @@ files and each file can only depend on the file included before it.
 """
 
 include("type.jl")
-using .type    # bring model into this module namespace (this module is a parent module)
+using .type    # bring type into parent module namespace 
 
 include("snnUtil.jl")
 using .snnUtil