[lang] Use less gpu memory when building sparse matrix #6781
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strongoier
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quadpixels
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Issue: taichi-dev#2906 ### Brief Summary The `read_int` function of ndarray consumes more than 100M gpu memory. It's better to use `memcpy_device_to_host` function to obtain `num_triplets_`.
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Issue: #2906
Brief Summary
The
read_intfunction of ndarray consumes more than 100M gpu memory. It's better to usememcpy_device_to_hostfunction to obtainnum_triplets_.