DualGMI: Fix type errors

src/Cuts/tableau/gmi_dual.jl

@@ -322,6 +322,9 @@ function _dualgmi_compress_h5(h5_filename)
     orig_cut_basis_vars = h5.get_array("cuts_basis_vars")
     orig_cut_basis_sizes = h5.get_array("cuts_basis_sizes")
     orig_cut_rows = h5.get_array("cuts_rows")
+    if orig_cut_basis_vars === nothing
+        return
+    end
     ncuts, _ = size(orig_cut_basis_vars)
     h5.close()
 
@@ -360,9 +363,11 @@ function _dualgmi_generate(train_h5, model)
     end
     @timeit "Collect cuts from H5 files" begin
         basis_vars_to_basis_offset = Dict()
-        combined_basis_vars = []
-        combined_basis_sizes = []
-        combined_cut_rows = []
+        combined_basis_sizes = nothing
+        combined_basis_sizes_list = Any[]
+        combined_basis_vars = nothing
+        combined_basis_vars_list = Any[]
+        combined_cut_rows = Any[]
         for h5_filename in train_h5
             @timeit "get_array (new)" begin
                 h5 = H5File(h5_filename, "r")
@@ -379,10 +384,10 @@ function _dualgmi_generate(train_h5, model)
                     vars = gmi_basis_vars[local_offset, :]
                     sizes = gmi_basis_sizes[local_offset, :]
                     if vars ∉ keys(basis_vars_to_basis_offset)
-                        combined_offset = length(combined_basis_vars) + 1
+                        combined_offset = length(combined_basis_vars_list) + 1
                         basis_vars_to_basis_offset[vars] = combined_offset
-                        push!(combined_basis_vars, vars)
-                        push!(combined_basis_sizes, sizes)
+                        push!(combined_basis_vars_list, vars)
+                        push!(combined_basis_sizes_list, sizes)
                         push!(combined_cut_rows, Set{Int}())
                     end
                     combined_offset = basis_vars_to_basis_offset[vars]
@@ -399,8 +404,8 @@ function _dualgmi_generate(train_h5, model)
                 end
             end
             @timeit "convert lists to matrices" begin
-                combined_basis_vars = hcat(combined_basis_vars...)'
-                combined_basis_sizes = hcat(combined_basis_sizes...)'
+                combined_basis_vars = hcat(combined_basis_vars_list...)'
+                combined_basis_sizes = hcat(combined_basis_sizes_list...)'
             end
         end
     end