System information

• OS Platform and Distribution (e.g., Linux Ubuntu 20.04): Ubuntu 20.04
• DeepRec version or commit id: 2325297
• Python version: python3.6.9
• Bazel version (if compiling from source):
• GCC/Compiler version (if compiling from source): 0.26.1
• CUDA/cuDNN version: None

Describe the current behavior
restore的时候加载 incremental_ckpt ev变量不能正确加载覆盖base里的ev变量

Describe the expected behavior
正确加载incr ev 覆盖对应的变量

Code to reproduce the issue

Provide a reproducible test case that is the bare minimum necessary to generate the problem.

Other info / logs

Include any logs or source code that would be helpful to diagnose the problem. If including tracebacks, please include the full traceback. Large logs and files should be attached.