fix compile error

Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>

Author: njzjz

source/api_cc/src/DeepPotJAX.cc

@@ -246,7 +246,8 @@ void deepmd::DeepPotJAX::init(const std::string& model,
  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x20, 0x1, 0x38, 0x1}};
 
  // Convert the desired percentage into a byte-array.
- auto bytes = reinterpret_cast<std::uint8_t*>(0.9);
+ double gpu_memory_fraction = 0.9;
+ auto bytes = reinterpret_cast<std::uint8_t*>(&gpu_memory_fraction);
 
  // Put it to the config byte-array, from 3 to 10:
  for (std::size_t i = 0; i < sizeof(gpu_memory_fraction); ++i) {