Chinese internet authorities summoned Nvidia on Thursday to discuss "serious security issues" over some of its artificial intelligence (AI) chips, as the US technology giant finds itself entangled in trade tensions between Beijing and Washington.

Nvidia is a world-leading producer of AI semiconductors, but the United States effectively restricts which chips it can export to China on national security grounds.

A key issue has been Chinese access to the "H20", a less powerful version of Nvidia's AI processing units that the company developed specifically for export to China.

The California-based firm said earlier this month that it would resume H20 sales to China after Washington pledged to remove licensing curbs that had halted exports.

But the firm still faces obstacles -- US lawmakers

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