Fix imports and client param error in Simple Wikipedia Demo

[georgewritescode]

Associated with this issue: #215

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Bug fixes to Simple Wikipedia Demo error

• Add missing imports
• Remove unused pytorch import
• Change batch size params to align to the current Python client

• What is the current behavior? (You can also link to an open issue here)
  See issue

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  No

• Have unit tests been run against this PR? (Has there also been any additional testing?)
  Tests ran, no additional testing

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added / updated (for bug fixes / features)

[jn2clark]

Thanks @georgewritescode ! My only suggestion is can we change the client_batch_size to be something larger, like 2000? To get the most out of the server batching it needs to receive enough to justify the multiple processes.

[pandu-k]

Thanks @georgewritescode ! My only suggestion is can we change the client_batch_size to be something larger, like 2000? To get the most out of the server batching it needs to receive enough to justify the multiple processes.

Setting this to client_batch_size=20, and removing processes has been the most portable solution in my experience