Check size on transformer cache #942
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Description
This PR reinstates a shape check on the entries of transformer cache. This PR is the minimal change required to address the issue highlighted in #881.
#881 was reported to have increased memory usage in normal operation. In that PR, the tensor shape was added to the cache key for better retrieval. However, this change led to many more cache entries and because this cache is a member of the Transformer, the lifetime of cache entries were tied to that of the Transformer and ultimately persisted too long.
Related: #881
List of changes:
Added dependencies: none
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