fix static prune bug (#2933)

static/slim/prune/prune.py

@@ -203,21 +203,7 @@ def main():
     assert FLAGS.prune_criterion in ['l1_norm', 'geometry_median'], \
             "unsupported prune criterion {}".format(FLAGS.prune_criterion)
     pruner = Pruner(criterion=FLAGS.prune_criterion)
-    train_prog = pruner.prune(
-        train_prog,
-        fluid.global_scope(),
-        params=pruned_params,
-        ratios=pruned_ratios,
-        place=place,
-        only_graph=False)[0]
-
-    compiled_train_prog = fluid.CompiledProgram(train_prog).with_data_parallel(
-        loss_name=loss.name,
-        build_strategy=build_strategy,
-        exec_strategy=exec_strategy)
-
     if FLAGS.eval:
-
         base_flops = flops(eval_prog)
         eval_prog = pruner.prune(
             eval_prog,
@@ -232,6 +218,19 @@ def main():
             pruned_flops))
         compiled_eval_prog = fluid.CompiledProgram(eval_prog)
 
+    train_prog = pruner.prune(
+        train_prog,
+        fluid.global_scope(),
+        params=pruned_params,
+        ratios=pruned_ratios,
+        place=place,
+        only_graph=False)[0]
+
+    compiled_train_prog = fluid.CompiledProgram(train_prog).with_data_parallel(
+        loss_name=loss.name,
+        build_strategy=build_strategy,
+        exec_strategy=exec_strategy)
+
     if FLAGS.resume_checkpoint:
         checkpoint.load_checkpoint(exe, train_prog, FLAGS.resume_checkpoint)
         start_iter = checkpoint.global_step()