, it is permissible, in a certain style, to drop articles. "Face detection using neural network" would be permissible in that style, but as the overall title of a report it seems too abbreviated to me personally. Opinions may vary.
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AnonymousMy question: is it grammatically correct to title a report as “Face detection using neural network”? what's about “Face detection using a neural network”?In my opinion, it's like this: