Colab - MethodError: no method matching (::Flux.LSTMCell{...

[IsaacBreen]

When I run this, I get an error.

using Flux
LSTM(5,5)(rand(5))

ERROR: MethodError: no method matching (::Flux.LSTMCell{Matrix{Float32}, Vector{Float32}, Tuple{Matrix{Float32}, Matrix{Float32}}})(::Tuple{Matrix{Float32}, Matrix{Float32}}, ::Vector{Float64})
Closest candidates are:
  (::Flux.LSTMCell{A, V, var"#s262"} where var"#s262"<:Tuple{AbstractMatrix{T}, AbstractMatrix{T}})(::Any, ::Union{AbstractVector{T}, AbstractMatrix{T}, Flux.OneHotArray}) where {A, V, T} at /root/.julia/packages/Flux/qp1gc/src/layers/recurrent.jl:137
Stacktrace:
 [1] (::Flux.Recur{Flux.LSTMCell{Matrix{Float32}, Vector{Float32}, Tuple{Matrix{Float32}, Matrix{Float32}}}, Tuple{Matrix{Float32}, Matrix{Float32}}})(x::Vector{Float64})
   @ Flux ~/.julia/packages/Flux/qp1gc/src/layers/recurrent.jl:34
 [2] top-level scope
   @ REPL[3]:1

This occurs on a Google Colab instance. To reproduce, paste the following into a Colab cell and run:

!wget -q https://julialang-s3.julialang.org/bin/linux/x64/1.6/julia-1.6.0-linux-x86_64.tar.gz
!tar zxf julia-1.6.0-linux-x86_64.tar.gz
!/content/julia-1.6.0/bin/julia -e "import Pkg; Pkg.add(\"Flux\"); using Flux; LSTM(5,5)(rand(5))"

[DhairyaLGandhi]

You might want to wrap the input in an array

[IsaacBreen]

LSTM(5,5)([rand(5)]) produces a very similar error (below). I've also tried LSTM(5,5)(rand(5,5)) and LSTM(5,5)(rand(5,5,5)) to no avail.

using Flux
LSTM(5,5)([rand(5)])

ERROR: MethodError: no method matching (::Flux.LSTMCell{Matrix{Float32}, Vector{Float32}, Tuple{Matrix{Float32}, Matrix{Float32}}})(::Tuple{Matrix{Float32}, Matrix{Float32}}, ::Vector{Vector{Float64}})
Closest candidates are:
  (::Flux.LSTMCell{A, V, var"#s262"} where var"#s262"<:Tuple{AbstractMatrix{T}, AbstractMatrix{T}})(::Any, ::Union{AbstractVector{T}, AbstractMatrix{T}, Flux.OneHotArray}) where {A, V, T} at /root/.julia/packages/Flux/qp1gc/src/layers/recurrent.jl:137
Stacktrace:
 [1] (::Flux.Recur{Flux.LSTMCell{Matrix{Float32}, Vector{Float32}, Tuple{Matrix{Float32}, Matrix{Float32}}}, Tuple{Matrix{Float32}, Matrix{Float32}}})(x::Vector{Vector{Float64}})
   @ Flux ~/.julia/packages/Flux/qp1gc/src/layers/recurrent.jl:34
 [2] top-level scope
   @ none:1

[darsnack]

Try rand(Float32, 5)

[IsaacBreen]

That works, thanks darsnack! I'm not sure why Julia 1.5.3 on my laptop can run Flux; LSTM(5,5)(rand(5)) without issue. rand(5) still returns Vector{Float64} and param(LSTM(5,5)) returns Params([Float32[..., but I guess 1.5.3 makes an implicit conversion somewhere in there.

Oh well. Thanks!

[darsnack]

Probably your laptop has an older version of Flux where we passively allowed the type promotion. The restriction was only put in with Flux v0.12.