lib/lightgbm.rb in lightgbm-0.1.4 vs lib/lightgbm.rb in lightgbm-0.1.5

@@ -18,11 +18,12 @@
 
   class << self
     attr_accessor :ffi_lib
   end
   lib_name = "lib_lightgbm.#{::FFI::Platform::LIBSUFFIX}"
-  self.ffi_lib = [lib_name, "lib_lightgbm.so"]
+  vendor_lib = File.expand_path("../vendor/#{lib_name}", __dir__)
+  self.ffi_lib = [lib_name, "lib_lightgbm.so", vendor_lib]
 
   # friendlier error message
   autoload :FFI, "lightgbm/ffi"
 
   class << self
@@ -36,9 +37,11 @@
           valid_contain_train = true
         else
           booster.add_valid(data, name || "valid_#{i}")
         end
       end
+
+      raise ArgumentError, "For early stopping, at least one validation set is required" if early_stopping_rounds && !valid_sets.any? { |v| v != train_set }
 
       booster.best_iteration = 0
 
       if early_stopping_rounds
         best_score = []