diff --git a/Project.toml b/Project.toml
index fa5a441..7a3d20d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "RecurrentLayers"
 uuid = "78449bcf-6750-4b78-9e82-63d4a1ccdf8c"
 authors = ["Francesco Martinuzzi"]
-version = "0.2.0"
+version = "0.2.1"
 
 [deps]
 Flux = "587475ba-b771-5e3f-ad9e-33799f191a9c"
diff --git a/src/RecurrentLayers.jl b/src/RecurrentLayers.jl
index 4172e48..dec1ab4 100644
--- a/src/RecurrentLayers.jl
+++ b/src/RecurrentLayers.jl
@@ -35,6 +35,11 @@ function (rlayer::AbstractRecurrentLayer)(inp::AbstractVecOrMat)
     return rlayer(inp, state)
 end
 
+function (rlayer::AbstractRecurrentLayer)(inp::AbstractArray, state::AbstractVecOrMat)
+    @assert ndims(inp) == 2 || ndims(inp) == 3
+    return scan(rlayer.cell, inp, state)
+end
+
 export MGUCell, LiGRUCell, IndRNNCell, RANCell, LightRUCell, RHNCell,
 RHNCellUnit, NASCell, MUT1Cell, MUT2Cell, MUT3Cell, SCRNCell, PeepholeLSTMCell,
 FastRNNCell, FastGRNNCell
@@ -42,7 +47,6 @@ export MGU, LiGRU, IndRNN, RAN, LightRU, NAS, RHN, MUT1, MUT2, MUT3,
 SCRN, PeepholeLSTM, FastRNN, FastGRNN
 
 
-#TODO add double bias
 include("mgu_cell.jl")
 include("ligru_cell.jl")
 include("indrnn_cell.jl")
diff --git a/src/fastrnn_cell.jl b/src/fastrnn_cell.jl
index 67e3ca2..6d6f513 100644
--- a/src/fastrnn_cell.jl
+++ b/src/fastrnn_cell.jl
@@ -88,7 +88,7 @@ struct FastRNN{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand FastRNN
+Flux.@layer :noexpand FastRNN
 
 @doc raw"""
     FastRNN((input_size => hidden_size), [activation]; kwargs...)
@@ -234,7 +234,7 @@ struct FastGRNN{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand FastGRNN
+Flux.@layer :noexpand FastGRNN
 
 @doc raw"""
     FastGRNN((input_size => hidden_size), [activation]; kwargs...)
@@ -279,9 +279,4 @@ function FastGRNN((input_size, hidden_size)::Pair, activation = tanh_fast;
     kwargs...)
     cell = FastGRNNCell(input_size => hidden_size, activation; kwargs...)
     return FastGRNN(cell)
-end
-  
-function (fastgrnn::FastGRNN)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(fastgrnn.call, inp, state)
 end
\ No newline at end of file
diff --git a/src/indrnn_cell.jl b/src/indrnn_cell.jl
index 94e5b06..ecd1738 100644
--- a/src/indrnn_cell.jl
+++ b/src/indrnn_cell.jl
@@ -74,7 +74,7 @@ struct IndRNN{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand IndRNN
+Flux.@layer :noexpand IndRNN
 
 @doc raw"""
     IndRNN((input_size, hidden_size)::Pair, σ = tanh, σ=relu;
@@ -113,9 +113,4 @@ See [`IndRNNCell`](@ref) for a layer that processes a single sequence.
 function IndRNN((input_size, hidden_size)::Pair, σ = tanh; kwargs...)
     cell = IndRNNCell(input_size, hidden_size, σ; kwargs...)
     return IndRNN(cell)
-end
-  
-function (indrnn::IndRNN)(inp, state) 
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(indrnn.cell, inp, state)
 end
\ No newline at end of file
diff --git a/src/lightru_cell.jl b/src/lightru_cell.jl
index 37de018..5eb4a87 100644
--- a/src/lightru_cell.jl
+++ b/src/lightru_cell.jl
@@ -82,7 +82,7 @@ struct LightRU{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand LightRU
+Flux.@layer :noexpand LightRU
 
 @doc raw"""
     LightRU((input_size => hidden_size)::Pair; kwargs...)
@@ -124,9 +124,4 @@ h_t         &= (1 - f_t) \odot h_{t-1} + f_t \odot \tilde{h}_t.
 function LightRU((input_size, hidden_size)::Pair; kwargs...)
     cell = LightRUCell(input_size => hidden_size; kwargs...)
     return LightRU(cell)
-end
-  
-function (lightru::LightRU)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(lightru.cell, inp, state)
-end
+end
\ No newline at end of file
diff --git a/src/ligru_cell.jl b/src/ligru_cell.jl
index 259a901..e8e30c1 100644
--- a/src/ligru_cell.jl
+++ b/src/ligru_cell.jl
@@ -75,12 +75,14 @@ function (ligru::LiGRUCell)(inp::AbstractVecOrMat, state)
     return new_state, new_state
 end
 
+Base.show(io::IO, ligru::LiGRUCell) =
+    print(io, "LiGRUCell(", size(ligru.Wi, 2), " => ", size(ligru.Wi, 1) ÷ 2, ")")
 
 struct LiGRU{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand LiGRU
+Flux.@layer :noexpand LiGRU
 
 @doc raw"""
     LiGRU((input_size => hidden_size)::Pair; kwargs...)
@@ -124,13 +126,4 @@ h_t &= z_t \odot h_{t-1} + (1 - z_t) \odot \tilde{h}_t
 function LiGRU((input_size, hidden_size)::Pair; kwargs...)
     cell = LiGRUCell(input_size => hidden_size; kwargs...)
     return LiGRU(cell)
-end
-  
-function (ligru::LiGRU)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(ligru.cell, inp, state)
-end
-
-
-Base.show(io::IO, ligru::LiGRUCell) =
-    print(io, "LiGRUCell(", size(ligru.Wi, 2), " => ", size(ligru.Wi, 1) ÷ 2, ")")
+end
\ No newline at end of file
diff --git a/src/mgu_cell.jl b/src/mgu_cell.jl
index 1a55e87..ce78015 100644
--- a/src/mgu_cell.jl
+++ b/src/mgu_cell.jl
@@ -81,7 +81,7 @@ struct MGU{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand MGU
+Flux.@layer :noexpand MGU
 
 @doc raw"""
     MGU((input_size => hidden_size)::Pair; kwargs...)
@@ -123,9 +123,4 @@ h_t         &= (1 - f_t) \odot h_{t-1} + f_t \odot \tilde{h}_t
 function MGU((input_size, hidden_size)::Pair; kwargs...)
     cell = MGUCell(input_size => hidden_size; kwargs...)
     return MGU(cell)
-end
-  
-function (mgu::MGU)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(mgu.cell, inp, state)
-end
+end
\ No newline at end of file
diff --git a/src/mut_cell.jl b/src/mut_cell.jl
index 2820474..0c9c60b 100644
--- a/src/mut_cell.jl
+++ b/src/mut_cell.jl
@@ -84,7 +84,7 @@ struct MUT1{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand MUT1
+Flux.@layer :noexpand MUT1
 
 @doc raw"""
     MUT1((input_size => hidden_size); kwargs...)
@@ -129,11 +129,6 @@ function MUT1((input_size, hidden_size)::Pair; kwargs...)
     return MUT1(cell)
 end
 
-function (mut::MUT1)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(mut.cell, inp, state)
-end
-
 
 struct MUT2Cell{I, H, V}  <: AbstractRecurrentCell
     Wi::I
@@ -220,7 +215,7 @@ struct MUT2{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand MUT2
+Flux.@layer :noexpand MUT2
 
 @doc raw"""
     MUT2Cell((input_size => hidden_size); kwargs...)
@@ -264,11 +259,6 @@ function MUT2((input_size, hidden_size)::Pair; kwargs...)
     cell = MUT2Cell(input_size => hidden_size; kwargs...)
     return MUT2(cell)
 end
-  
-function (mut::MUT2)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(mut.cell, inp, state)
-end
 
 
 struct MUT3Cell{I, H, V} <: AbstractRecurrentCell
@@ -354,7 +344,7 @@ struct MUT3{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand MUT3
+Flux.@layer :noexpand MUT3
 
 @doc raw"""
     MUT3((input_size => hidden_size); kwargs...)
@@ -397,9 +387,4 @@ h_{t+1} &= \tanh(U_h (r \odot h_t) + W_h x_t + b_h) \odot z \\
 function MUT3((input_size, hidden_size)::Pair; kwargs...)
     cell = MUT3Cell(input_size => hidden_size; kwargs...)
     return MUT3(cell)
-end
-  
-function (mut::MUT3)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(mut.cell, inp, state)
 end
\ No newline at end of file
diff --git a/src/nas_cell.jl b/src/nas_cell.jl
index e27f92d..868fda0 100644
--- a/src/nas_cell.jl
+++ b/src/nas_cell.jl
@@ -148,7 +148,7 @@ struct NAS{M} <: AbstractRecurrentLayer
     cell::M
 end
 
-Flux.@layer :expand NAS
+Flux.@layer :noexpand NAS
 
 @doc raw"""
     NAS((input_size => hidden_size)::Pair; kwargs...)
@@ -211,9 +211,4 @@ h_{\text{new}} &= \tanh(c_{\text{new}} \cdot l_5)
 function NAS((input_size, hidden_size)::Pair; kwargs...)
     cell = NASCell(input_size => hidden_size; kwargs...)
     return NAS(cell)
-end
-
-function (nas::NAS)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(nas.cell, inp, state)
-end
+end
\ No newline at end of file
diff --git a/src/peepholelstm_cell.jl b/src/peepholelstm_cell.jl
index 001180b..ac71e1a 100644
--- a/src/peepholelstm_cell.jl
+++ b/src/peepholelstm_cell.jl
@@ -86,7 +86,7 @@ struct PeepholeLSTM{M} <: AbstractRecurrentLayer
     cell::M
 end
 
-Flux.@layer :expand PeepholeLSTM
+Flux.@layer :noexpand PeepholeLSTM
 
 @doc raw"""
     PeepholeLSTM((input_size => hidden_size)::Pair; kwargs...)
@@ -130,9 +130,4 @@ h_t &= o_t \odot \sigma_h(c_t).
 function PeepholeLSTM((input_size, hidden_size)::Pair; kwargs...)
     cell = PeepholeLSTM(input_size => hidden_size; kwargs...)
     return PeepholeLSTM(cell)
-end
-
-function (lstm::PeepholeLSTM)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(lstm.cell, inp, state)
-end
+end
\ No newline at end of file
diff --git a/src/ran_cell.jl b/src/ran_cell.jl
index c94bb7f..c2f393f 100644
--- a/src/ran_cell.jl
+++ b/src/ran_cell.jl
@@ -88,7 +88,7 @@ struct RAN{M} <: AbstractRecurrentLayer
     cell::M
 end
 
-Flux.@layer :expand RAN
+Flux.@layer :noexpand RAN
 
 @doc raw"""
     RAN(input_size => hidden_size; kwargs...)
@@ -137,10 +137,4 @@ h_t         &= g(c_t)
 function RAN((input_size, hidden_size)::Pair; kwargs...)
     cell = RANCell(input_size => hidden_size; kwargs...)
     return RAN(cell)
-end
-
-function (ran::RAN)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(ran.cell, inp, state)
-end
-
+end
\ No newline at end of file
diff --git a/src/rhn_cell.jl b/src/rhn_cell.jl
index 3df2bd9..6a5866b 100644
--- a/src/rhn_cell.jl
+++ b/src/rhn_cell.jl
@@ -138,7 +138,7 @@ struct RHN{M}
     cell::M
 end
   
-Flux.@layer :expand RHN
+Flux.@layer :noexpand RHN
 
 @doc raw"""
     RHN((input_size => hidden_size)::Pair depth=3; kwargs...)
diff --git a/src/scrn_cell.jl b/src/scrn_cell.jl
index 117ba1c..4b0b6e5 100644
--- a/src/scrn_cell.jl
+++ b/src/scrn_cell.jl
@@ -92,7 +92,7 @@ struct SCRN{M} <: AbstractRecurrentLayer
     cell::M
 end
   
-Flux.@layer :expand SCRN
+Flux.@layer :noexpand SCRN
 
 @doc raw"""
     SCRN((input_size => hidden_size)::Pair;
@@ -139,9 +139,4 @@ y_t &= f(U_y h_t + W_y s_t)
 function SCRN((input_size, hidden_size)::Pair; kwargs...)
     cell = SCRNCell(input_size => hidden_size; kwargs...)
     return SCRN(cell)
-end
-  
-function (scrn::SCRN)(inp, state)
-    @assert ndims(inp) == 2 || ndims(inp) == 3
-    return scan(scrn.cell, inp, state)
 end
\ No newline at end of file