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[CherryPick] forward compability for checkpoint (#71810) #71857

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[CherryPick] forward compability for checkpoint (#71810) #71857

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21 changes: 12 additions & 9 deletions paddle/fluid/pybind/generator_py.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -56,21 +56,24 @@ void BindGenerator(py::module* m_ptr) {
return py::make_tuple(s.device, s.seed, s.offset, bitstream);
},
[](py::tuple s) { // __setstate__
if (s.size() != 4)
if (s.size() != 3 && s.size() != 4)
throw std::runtime_error(
"Invalid Random state. Please check the format(device, "
"current_seed, thread_offset ,rng_state).");
"current_seed, thread_offset [, rng_state]).");
int64_t device = s[0].cast<int64_t>();
int64_t seed = s[1].cast<int64_t>();
uint64_t offset = s[2].cast<uint64_t>();
// NOTE(zhangwl):switch bitstream to mt19937_64;
std::vector<uint8_t> bitstream = s[3].cast<std::vector<uint8_t>>();
std::string str(bitstream.begin(), bitstream.end());
std::stringstream ss(str);
std::mt19937_64 rng;
ss >> rng;
std::shared_ptr<std::mt19937_64> cpu_engine =
std::make_shared<std::mt19937_64>(rng);
std::shared_ptr<std::mt19937_64> cpu_engine = nullptr;
if (s.size() == 4) {
std::vector<uint8_t> bitstream =
s[3].cast<std::vector<uint8_t>>();
std::string str(bitstream.begin(), bitstream.end());
std::stringstream ss(str);
std::mt19937_64 rng;
ss >> rng;
cpu_engine = std::make_shared<std::mt19937_64>(rng);
}
phi::Generator::GeneratorState state(
device, seed, offset, cpu_engine);
return state;
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