Fix deadlock when passing generators to fit() with TF 2.13
#1369
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with keras 2.13, generators are converted to tf.data pipelines with a prefetch operation. This caused a deadlock, where a queue consumer for the generator was not insync with the main-thread queue producer scheduled as a keras callback. This removes the callback scheduler and manual eventloop, defaulting to standard python evaluation semantics, where we depend on tasks scheduled on the main thread to be able to run while the main thread is blocked. related: rstudio/tensorflow#575
related: rstudio/reticulate#1405
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Related: tensorflow/tensorflow#47321 |
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Also, fixes some misc failing tests due to symbols moving.