In the graded assignment for module 4, under the section " 4 - Retrieving Items Based on Metadata Inferred from a Query", when the values dict is created, if you inspect it it contains nan values for the baseColour keys
are you saying generated_metadata_query got you nan values?
I just wrote the codes and I got basecolor 
but when I go subsequent to next section 4.2 loading the Weaviate product collection, the len function for product collection threw an IPC error (did you also encounter same error?
ok now that ipc error got resolved by clearing out kernel output and re-running the cell