reorganize examples for tvm-ffi
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Fung Xie
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import cutlass
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import cutlass.cute as cute
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"""
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Example of using fake tensors in CuTe.
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This script demonstrates how to use fake tensors in CuTe to drive compilation without creating actual tensors
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from frameworks like PyTorch or TensorFlow.
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Run this file directly to see the output type information.
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"""
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@cute.jit
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def print_tensor_type(t: cute.Tensor):
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print(t)
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def run():
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from cutlass.cute.runtime import make_fake_compact_tensor, make_fake_tensor
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shape = (3, 4)
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a = make_fake_compact_tensor(cutlass.Float16, (3, 4), stride_order=(1, 0))
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cute.compile(print_tensor_type, a, options="--enable-tvm-ffi")
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# 32-bit symbolic integer with divisibility 8
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shape = (3, cute.sym_int32(divisibility=8))
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a = make_fake_compact_tensor(cutlass.Float16, shape, stride_order=(1, 0))
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cute.compile(print_tensor_type, a, options="--enable-tvm-ffi")
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# with static stride
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a = make_fake_tensor(cutlass.Float16, shape, stride=(4, 1))
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cute.compile(print_tensor_type, a, options="--enable-tvm-ffi")
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# with dynamic stride using 32bit integer
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stride = (cute.sym_int32(divisibility=8), 1)
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a = make_fake_tensor(cutlass.Float16, shape, stride=stride)
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cute.compile(print_tensor_type, a, options="--enable-tvm-ffi")
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# with dynamic stride using 64bit integer
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stride = (cute.sym_int64(divisibility=8), 1)
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a = make_fake_tensor(cutlass.Float16, shape, stride=stride)
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cute.compile(print_tensor_type, a, options="--enable-tvm-ffi")
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if __name__ == "__main__":
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run()
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# Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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# SPDX-License-Identifier: BSD-3-Clause
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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# 3. Neither the name of the copyright holder nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import sys
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import os
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import torch
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import time
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import cutlass
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import cutlass.cute as cute
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from cutlass.cute.runtime import from_dlpack
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"""Demonstrates calling off-the-shelf kernels with TVM FFI without DLPack.
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This example shows how to compile CuTe JIT function with fake tensors then run it with TVM FFI.
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"""
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if __name__ == "__main__":
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# Add the current directory to sys.path
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current_dir = os.path.dirname(os.path.abspath(__file__))
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sys.path.insert(0, os.path.join(current_dir, ".."))
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from ampere.tensorop_gemm import TensorOpGemm
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def compile_op(use_tvm_ffi: bool = True):
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from cutlass.cute.runtime import make_fake_compact_tensor, make_fake_tensor
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a_shape = (cute.sym_int(), cute.sym_int(divisibility=16), cute.sym_int())
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b_shape = (cute.sym_int(), cute.sym_int(divisibility=16), cute.sym_int())
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c_shape = (cute.sym_int(), cute.sym_int(divisibility=16), cute.sym_int())
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a = make_fake_compact_tensor(
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cutlass.Float16, a_shape, stride_order=(1, 0, 2), assumed_align=16
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)
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b = make_fake_compact_tensor(
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cutlass.Float16, b_shape, stride_order=(1, 0, 2), assumed_align=16
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)
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c = make_fake_compact_tensor(
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cutlass.Float16, c_shape, stride_order=(1, 0, 2), assumed_align=16
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)
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tensor_op_gemm = TensorOpGemm(
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cutlass.Float16, cutlass.Float16, cutlass.Float32, (2, 2, 1)
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)
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compiled_fn = cute.compile(
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tensor_op_gemm, a, b, c, options="--enable-tvm-ffi" if use_tvm_ffi else ""
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)
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return compiled_fn
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def run_op(compiled_fn, mnkl, *, use_tvm_ffi: bool = True):
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print("\nRunning TensorOpGemm test with:")
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print(f"Tensor dimensions: {mnkl}")
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torch.manual_seed(1112)
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# (M,K,L)
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a_torch = torch.randn(
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mnkl[3], mnkl[0], mnkl[2], dtype=torch.float16, device="cuda"
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).permute(1, 2, 0)
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# (N,K,L)
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b_torch = torch.randn(
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mnkl[3], mnkl[1], mnkl[2], dtype=torch.float16, device="cuda"
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).permute(1, 2, 0)
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# (N,M,L)
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c_torch = torch.randn(
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mnkl[3], mnkl[0], mnkl[1], dtype=torch.float16, device="cuda"
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).permute(1, 2, 0)
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print("Input tensor shapes:")
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print(f"a: {a_torch.shape}, dtype: {a_torch.dtype}")
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print(f"b: {b_torch.shape}, dtype: {b_torch.dtype}")
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print(f"c: {c_torch.shape}, dtype: {c_torch.dtype}\n")
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if not use_tvm_ffi:
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a = from_dlpack(a_torch).mark_layout_dynamic(leading_dim=1)
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b = from_dlpack(b_torch).mark_layout_dynamic(leading_dim=1)
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c = from_dlpack(c_torch).mark_layout_dynamic(leading_dim=1)
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else:
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a = a_torch
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b = b_torch
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c = c_torch
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# pass in torch tensor as input
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compiled_fn(a, b, c)
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torch.cuda.synchronize()
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# measure the launch overhead of tvm ffi function
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repeat = 100
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start_time = time.time()
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for i in range(repeat):
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compiled_fn(a, b, c)
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end_time = time.time()
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print(
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f"Launch overhead of tvm ffi function: {(end_time - start_time) / repeat} seconds"
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)
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ref = torch.einsum("mkl,nkl->mnl", a_torch, b_torch)
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torch.testing.assert_close(c_torch, ref, atol=1e-05, rtol=1e-05)
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print("\n[DSL INFO] Results verified successfully!")
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print(f"First few elements of result: \n{c_torch[:3, :3, :3]}")
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if __name__ == "__main__":
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compiled_fn = compile_op(use_tvm_ffi=False)
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run_op(compiled_fn, [512, 512, 256, 1], use_tvm_ffi=False)
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compiled_fn = compile_op(use_tvm_ffi=True)
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run_op(compiled_fn, [512, 512, 256, 1], use_tvm_ffi=True)
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