Relaxed Synchronization of Predictor and Recognizer
The data-flow dependencies between Follows/Restrictor and CKY-restrict do not permit
the extent of parallelism we witnessed in the CKY-span-control. The synchronization
requirement for CKY-restrict moves along successive diagonals of the recognition matrix,
whereas that for Follows/Restrictor moves along its columns. The combination of these
two destroy a substantial extent of the parallelism available. We can, however, relax the
strict synchronization to produce an asynchronous parallel algorithm that is nondeter-
ministic. We may allow lax synchronization in the access to CKY-restrict in
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