Add TEST.TEST_MODEL path validation (#134)

* update solver.py and model_builder.py

* update solver.py

* update infer.py

* update model_builder.py for fitting different aug_method

* update model_builder.py

* update model_builder.py

* update export process

* save best model

* update train.py

* update train.py

* update train.py

* eval for last epoch model

* check model path

* check TEST.TEST_MODEL

pdseg/eval.py

@@ -111,6 +111,9 @@ def evaluate(cfg, ckpt_dir=None, use_gpu=False, use_mpio=False, **kwargs):
 
     ckpt_dir = cfg.TEST.TEST_MODEL if not ckpt_dir else ckpt_dir
 
+    if not os.path.exists(ckpt_dir):
+        raise ValueError('The TEST.TEST_MODEL {} is not found'.format(ckpt_dir))
+
     if ckpt_dir is not None:
         print('load test model:', ckpt_dir)
         fluid.io.load_params(exe, ckpt_dir, main_program=test_prog)