fix the crash when input variable is bool type, test=develop

Author: winter-wang

python/paddle/fluid/io.py

@@ -1378,7 +1378,7 @@ def save_inference_model(dirname,
     with program_guard(main_program):
         uniq_target_vars = []
         for i, var in enumerate(target_vars):
-            if isinstance(var, Variable):
+            if isinstance(var, Variable) and var.dtype != paddle.bool:
                 var = layers.scale(
                     var, 1., name="save_infer_model/scale_{}".format(i))
             uniq_target_vars.append(var)

python/paddle/static/io.py

@@ -192,8 +192,9 @@ def normalize_program(program, feed_vars, fetch_vars):
     with program_guard(program):
         uniq_fetch_vars = []
         for i, var in enumerate(fetch_vars):
-            var = layers.scale(
-                var, 1., name="save_infer_model/scale_{}".format(i))
+            if var.dtype != paddle.bool:
+                var = layers.scale(
+                    var, 1., name="save_infer_model/scale_{}".format(i))
             uniq_fetch_vars.append(var)
         fetch_vars = uniq_fetch_vars