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#define CUB_IGNORE_DEPRECATED_API
#undef CUB_WRAPPED_NAMESPACE
#define CUB_WRAPPED_NAMESPACE megablocks
#include "new_histogram.h"
#include "gpu_backend.h"
#include <cstdint>
namespace megablocks {
template <typename T>
torch::Tensor cub_histogram(torch::Tensor x, int num_bins) {
// Allocate the count buffer.
auto options = torch::TensorOptions()
.dtype(torch::kInt32)
.device(x.device());
torch::Tensor out = torch::empty({x.size(0), num_bins}, options);
// Exit early if there is not work to do.
if (out.numel() == 0) return out;
// Get scratchpad size.
size_t scratchpad_bytes = 0;
GPU_CALL(cubns::DeviceHistogram::HistogramEven(nullptr,
scratchpad_bytes,
x.data_ptr<T>(),
out.data_ptr<int>(),
/*num_levels=*/num_bins + 1,
/*lower_level=*/0,
/*upper_level=*/num_bins,
/*num_samples=*/int(x.size(1)),
megablocks::get_current_stream()));
// Allocate scratchpad.
options = torch::TensorOptions().dtype(torch::kInt8).device(x.device());
torch::Tensor scratchpad = torch::empty(scratchpad_bytes, options);
// Run the kernel.
for (int i = 0; i < x.size(0); ++i) {
GPU_CALL(cubns::DeviceHistogram::HistogramEven(scratchpad.data_ptr(),
scratchpad_bytes,
x.data_ptr<T>() + x.size(1) * i,
out.data_ptr<int>() + out.size(1) * i,
/*num_levels=*/num_bins + 1,
/*lower_level=*/0,
/*upper_level=*/num_bins,
/*num_samples=*/int(x.size(1)),
megablocks::get_current_stream()));
}
return out;
}
torch::Tensor histogram(torch::Tensor x, int num_bins) {
TORCH_CHECK(x.is_cuda());
TORCH_CHECK(x.ndimension() == 1 || x.ndimension() == 2);
TORCH_CHECK(x.scalar_type() == torch::kInt16 ||
x.scalar_type() == torch::kInt32 ||
x.scalar_type() == torch::kInt64);
bool no_batch = x.ndimension() == 1;
if (no_batch) x = x.view({1, x.numel()});
if (x.scalar_type() == torch::kInt16) {
auto out = cub_histogram<short>(x, num_bins);
return no_batch ? out.flatten() : out;
} else if (x.scalar_type() == torch::kInt32) {
auto out = cub_histogram<int>(x, num_bins);
return no_batch ? out.flatten() : out;
} else {
TORCH_CHECK(x.scalar_type() == torch::kInt64);
auto out = cub_histogram<long>(x, num_bins);
return no_batch ? out.flatten() : out;
}
}
} // namespace megablocks
#undef CUB_WRAPPED_NAMESPACE
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