@lanking520 I had run into this issue before and had a similar resolution. I
can't recall why these logger imports were removed from the tutorial. What can
be done to make this easier and not throw errors?
Also, on a similar note, when building the scalapkg for docs there are a lot of
these errors, and it would be nice if they went away... Here's just one example:
```
./core/src/main/scala/org/apache/mxnet/Callback.scala:20: error: object slf4j
is not a member of package org
import org.slf4j.{Logger, LoggerFactory}
^
```
[ Full content available at:
https://github.com/apache/incubator-mxnet/issues/12523 ]
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