Course 5,Week 4,Transformer, All test passed, grade failed

Hi,I passed the test for Exercise 8 - Transformer, however failed the grade with information below:
cell_UNQ_C8 function Transformer.call failed test 1
Appreciate any help I can get.

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(edited)
General advice:
Try restarting the kernel, clearing all the output cells, and run all the cells again.
Then submit.

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