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修复 pb 场景下，指定 "model_dir=."时，导致的 import 路径有问题
(Optional) More detailed description for this PR(en: English/zh: Chinese).
en: fix a problem in the pb scenario when specifying "model_dir=." that cause a problem with the import path
zh(optional): 修复 pb 场景下，指定 "model_dir=."时，导致的 import 路径有问题
import (
_ "a/b/c//api"
)
(Optional) Which issue(s) this PR fixes:
(Optional) The PR that updates user documentation:
What type of PR is this?
fix
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(Optional) Translate the PR title into Chinese.
修复 pb 场景下，指定 "model_dir=."时，导致的 import 路径有问题
(Optional) More detailed description for this PR(en: English/zh: Chinese).
en: fix a problem in the pb scenario when specifying "model_dir=." that cause a problem with the import path zh(optional): 修复 pb 场景下，指定 "model_dir=."时，导致的 import 路径有问题
(Optional) Which issue(s) this PR fixes:
(Optional) The PR that updates user documentation: