Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/14734
Fixed a couple more warnings from CRAN check:
```
Consider adding
importFrom("methods", "is", "new", "signature")
importFrom("stats", "gaussian", "rpois", "runif", "setNames")
importFrom("utils", "download.file", "packageVersion", "untar")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').
* checking Rd \usage sections ... WARNING
Undocumented arguments in documentation object 'spark.als'
â...â
Found the following (possibly) invalid URLs:
URL: https://cran.r-project.org/web/packages/e1071/
From: man/spark.naiveBayes.Rd
Status: 200
Message: OK
CRAN URL not in canonical form
URL: https://cran.r-project.org/web/packages/mixtools/
From: man/spark.gaussianMixture.Rd
Status: 200
Message: OK
CRAN URL not in canonical form
URL: https://cran.r-project.org/web/packages/survival/
From: man/spark.survreg.Rd
Status: 200
Message: OK
CRAN URL not in canonical form
URL: https://cran.r-project.org/web/packages/topicmodels/
From: man/spark.lda.Rd
Status: 200
Message: OK
CRAN URL not in canonical form
```
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