TensorBoard Summary generation. Provides type safe wrappers around raw string emitting CoreOps.

Example use:

-- Call summary functions while constructing the graph.
createModel = do
  loss <- -- ...
  TF.scalarSummary loss

-- Write summaries to an EventWriter.
train = TF.withEventWriter "/path/to/logs" $ \eventWriter -> do
    summaryTensor <- TF.build TF.allSummaries
    forM_ [1..] $ \step -> do
        if (step % 100 == 0)
            then do
                ((), summaryBytes) <- TF.run (trainStep, summaryTensor)
                let summary = decodeMessageOrDie (TF.unScalar summaryBytes)
                TF.logSummary eventWriter step summary
            else TF.run_ trainStep