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vertex ai vision product recognizer

Hello experts.
I am guiding a customer who is testing the Vertex AI vision product recognizer for the first time.
Customers misunderstand that there is no need to learn the product recognizer because it has a pre-trained model, but what I got from the guide seems to be that at least you need to create a catalog and train each product image.
I would like to check again whether what I think is correct, or whether there is no need for separate learning because Google has a large amount of product data.
Thanks in advance for your help.

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