compile/runtime errors (( ubuntu

[221V]

/LambdaNet/AI/Network/FeedForwardNetwork.hs:37:10: error:
        • No instance for (Semigroup FeedForwardNetwork)
            arising from the superclasses of an instance declaration
        • In the instance declaration for ‘Monoid FeedForwardNetwork’
       |
    37 | instance Monoid FeedForwardNetwork where
       |          ^^^^^^^^^^^^^^^^^^^^^^^^^

[221V]

fix this by add

instance Semigroup FeedForwardNetwork where
--  mempty = emptyFeedForwardNetwork
  (<>) = addFeedForwardNetworks

compile ok, but i get error when run xor example

==> XOR predictions: 
*** Exception: different dimensions 1 and 2 in dot product
CallStack (from HasCallStack):
  error, called at src/Internal/Numeric.hs:675:19 in hmatrix-0.19.0.0-2s9G4ERdQNGmPHLhVSJnl:Internal.Numeric