fix the label hash funciton

[Myse1f]

fix for #87 determin the hash process according the label foramt:

• the label is number format, directly return number
• otherwise, use the hash funciton to hash to label

[Myse1f]

After merging this code, could help release a new version.

[Myse1f]

wierd that cannot setup python3.6 in workflow❓