#1 更新 'example/mnist-embeddings.py'

<!--- Provide a general summary of your changes in the Title above --> ## Description <!--- Describe your changes in detail --> ## Motivation and Context <!--- Why is this change required? What problem does it solve? --> <!--- If it fixes an open issue, please link to the issue here. --> ## How Has This Been Tested? <!--- Please describe in detail how you tested your changes. --> <!--- Include details of your testing environment, experiments you ran to see how --> <!--- your change affects existing areas of the code and their behaviors, etc. --> <!--- One method of testing is to run the `demo.py` script from the examples --> <!--- both on your branch and a clean branch and ensure that none of the functionality --> <!--- appears different. Be sure to install from source when testing. --> ## Screenshots (if appropriate): ## Types of changes <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: --> - [ ] Bug fix (non-breaking change which fixes an issue) - [ ] New feature (non-breaking change which adds functionality) - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected) - [ ] Code refactor or cleanup (changes to existing code for improved readability or performance) ## Checklist: <!--- Go over all the following points, and put an `x` in all the boxes that apply. --> <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! --> - [ ] I adapted the version number under `py/visdom/VERSION` according to [Semantic Versioning](https://semver.org/) - [ ] My code follows the code style of this project. - [ ] My change requires a change to the documentation. - [ ] I have updated the documentation accordingly.