Linear Regression example in README doesn't work

[ViralBShah]

All the other examples work fine. The linear regression doesn't work.

julia> @mpi_do man copy!(A, Float32[2 1; 1 2])
ERROR: TaskFailedException:
On worker 4:
ArgumentError: arrays must have the same axes for copy! (consider using `copyto!`)
copy! at ./abstractarray.jl:719
top-level scope at none:1
eval at ./boot.jl:331 [inlined]
#7 at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:510
#103 at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:290
run_work_thunk at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:79
run_work_thunk at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:88
#96 at ./task.jl:356
Stacktrace:
 [1] #remotecall_fetch#143 at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:394 [inlined]
 [2] remotecall_fetch(::Function, ::Distributed.Worker, ::Future) at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:386
 [3] remotecall_fetch(::Function, ::Int64, ::Future; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:421
 [4] remotecall_fetch at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:421 [inlined]
 [5] macro expansion at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:493 [inlined]
 [6] (::MPIClusterManagers.var"#25#28"{Future})() at ./task.jl:356

...and 3 more exception(s).

Stacktrace:
 [1] sync_end(::Channel{Any}) at ./task.jl:314
 [2] macro expansion at ./task.jl:333 [inlined]
 [3] mpi_do(::MPIManager, ::Function) at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:490
 [4] top-level scope at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:511

julia> @mpi_do man copy!(B, Float32[4, 5])
ERROR: TaskFailedException:
On worker 4:
ArgumentError: arrays must have the same axes for copy! (consider using `copyto!`)
copy! at ./abstractarray.jl:719
top-level scope at none:1
eval at ./boot.jl:331 [inlined]
#9 at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:510
#103 at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:290
run_work_thunk at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:79
run_work_thunk at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:88
#96 at ./task.jl:356
Stacktrace:
 [1] #remotecall_fetch#143 at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:394 [inlined]
 [2] remotecall_fetch(::Function, ::Distributed.Worker, ::Future) at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:386
 [3] remotecall_fetch(::Function, ::Int64, ::Future; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:421
 [4] remotecall_fetch at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:421 [inlined]
 [5] macro expansion at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:493 [inlined]
 [6] (::MPIClusterManagers.var"#25#28"{Future})() at ./task.jl:356

...and 3 more exception(s).

Stacktrace:
 [1] sync_end(::Channel{Any}) at ./task.jl:314
 [2] macro expansion at ./task.jl:333 [inlined]
 [3] mpi_do(::MPIManager, ::Function) at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:490
 [4] top-level scope at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:511

[christopher-dG]

Have you tried using copyto! as recommended?

[ViralBShah]

Yes, the copyto! does not produce an error. I haven't checked if it does the same thing that is intended. The ridge regression seems to work fine. The lasso fails to converge.

julia> @mpi_do man X = Elemental.ridge(A, B, 0f0)

julia> @mpi_do man X = Elemental.bpdn(A, B, 0.1f0)
      From worker 2:	0: ||x-z||_2=2.23607, epsPri=1.08571e-16, |rho| ||z-zOld||_2=0, and epsDual=1.08571e-16, objective=5.68434e-13
      From worker 2:	1: ||x-z||_2=2.23607, epsPri=1.08571e-16, |rho| ||z-zOld||_2=0, and epsDual=1.08571e-16, objective=5.68434e-13
      From worker 2:	2: ||x-z||_2=2.23607, epsPri=1.08571e-16, |rho| ||z-zOld||_2=0, and epsDual=1.08571e-16, objective=5.68434e-13
      From worker 2:	3: ||x-z||_2=2.23607, epsPri=1.08571e-16, |rho| ||z-zOld||_2=0, and epsDual=1.08571e-16, objective=5.68434e-13
      From worker 4:	Process 2 caught error message:
      From worker 4:	Lasso failed to converge
      From worker 4:	
      From worker 3:	Process 1 caught error message:
      From worker 3:	Lasso failed to convergeERROR: 
TaskFailedException:
Error deserializing a remote exception from worker 4
Remote(original) exception of type Elemental.RuntimeError
Remote stacktrace : 
ElError at /Users/viral/.julia/packages/Elemental/SF7xW/src/error.jl:20
bpdn! at /Users/viral/.julia/packages/Elemental/SF7xW/src/lapack_like/euclidean_min.jl:38 [inlined]
bpdn at /Users/viral/.julia/packages/Elemental/SF7xW/src/lapack_like/euclidean_min.jl:49
top-level scope at none:1
eval at ./boot.jl:331 [inlined]
#21 at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:510
#103 at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:290
run_work_thunk at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:79
run_work_thunk at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/process_messages.jl:88
#96 at ./task.jl:356
Stacktrace:
 [1] #remotecall_fetch#143 at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:394 [inlined]
 [2] remotecall_fetch(::Function, ::Distributed.Worker, ::Future) at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:386
 [3] remotecall_fetch(::Function, ::Int64, ::Future; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:421
 [4] remotecall_fetch at /Users/viral/julia/usr/share/julia/stdlib/v1.5/Distributed/src/remotecall.jl:421 [inlined]
 [5] macro expansion at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:493 [inlined]
 [6] (::MPIClusterManagers.var"#25#28"{Future})() at ./task.jl:356

...and 3 more exception(s).
      From worker 3:	
Stacktrace:

 [1]       From worker 5:	Process 3 caught error message:sync_end
(      From worker 5:	Lasso failed to converge::
Channel      From worker 5:	{
Any}      From worker 2:	Process 0 caught error message:)
 at       From worker 2:	Lasso failed to converge./task.jl:314

      From worker 2:	 [2] 
macro expansion at ./task.jl:333 [inlined]
 [3] mpi_do(::MPIManager, ::Function) at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:490
 [4] top-level scope at /Users/viral/.julia/packages/MPIClusterManagers/0ZYYQ/src/mpimanager.jl:511

[ViralBShah]

Should the README be updated for copyto?