masahi commented on code in PR #11631:
URL: https://github.com/apache/tvm/pull/11631#discussion_r894860104
##########
python/tvm/contrib/cutlass/build.py:
##########
@@ -346,187 +357,271 @@ def tune_cutlass_kernels(
for var in mod.get_global_vars():
fun_name = var.name_hint
func = mod[fun_name]
- annotator = OpAnnotator()
if "cutlass" in fun_name:
num_cutlass_partition += 1
- annotator.visit(func)
- out_shape = annotator.signature["ret_shape"]
- out_dtype = annotator.signature["ret_dtype"]
- op_type = annotator.signature["op_type"]
-
- new_attrs = {"op_type": op_type}
- new_attrs.update(annotator.signature)
- new_attrs.update(func.attrs)
- arg0_shape = new_attrs["arg0_shape"]
- arg1_shape = new_attrs["arg1_shape"]
- arg0_dtype = new_attrs["arg0_dtype"]
- arg1_dtype = new_attrs["arg1_dtype"]
-
- if "conv2d" in op_type:
- new_attrs["padding"] = annotator.op_attrs.padding
- new_attrs["strides"] = annotator.op_attrs.strides
- new_attrs["dilation"] = annotator.op_attrs.dilation
-
- if "conv2d_transpose" in op_type:
- d_shape = out_shape
- w_shape = arg1_shape
- elif "conv2d_backward_weight" in op_type:
- d_shape = arg1_shape
- w_shape = out_shape
- else:
- d_shape = arg0_shape
- w_shape = arg1_shape
-
- new_attrs.update(
- handle_conv2d(
- conv2d_profiler,
- op_type,
- d_shape,
- w_shape,
- annotator.op_attrs.padding,
- annotator.op_attrs.strides,
- annotator.op_attrs.dilation,
- out_dtype,
- arg0_dtype,
- arg1_dtype,
- use_3xtf32,
- split_k_slices,
- profile_all_alignments,
- find_first_valid,
- use_multiprocessing,
- )
- )
- elif "batch_matmul" in op_type:
- new_attrs.update(
- handle_batch_matmul(
- gemm_profiler,
- op_type,
- arg0_shape,
- arg1_shape,
- out_dtype,
- arg0_dtype,
- arg1_dtype,
- use_3xtf32,
- find_first_valid,
- use_multiprocessing,
- )
- )
- elif "dense" in op_type:
- new_attrs.update(
- handle_dense(
- gemm_profiler,
- op_type,
- arg0_shape,
- arg1_shape,
- out_dtype,
- arg0_dtype,
- arg1_dtype,
- use_3xtf32,
- find_first_valid,
- use_multiprocessing,
- )
- )
- else:
- raise ValueError("%s unsupported composite" % op_type)
-
- new_attrs = tvm.ir.make_node("DictAttrs", **new_attrs)
- new_func = relay.Function(
- func.params,
- func.body,
- ret_type=func.ret_type,
- type_params=func.type_params,
- attrs=new_attrs,
+ new_func = tune_cutlass_function(
+ func,
+ use_3xtf32,
+ split_k_slices,
+ profile_all_alignments,
+ find_first_valid,
+ use_multiprocessing,
+ gemm_profiler,
+ conv2d_profiler,
)
mod.update_func(var, new_func)
return mod, num_cutlass_partition
-def build_cutlass_kernels(
- lib, sm, tmp_dir="./tmp", lib_path="compile.so", threads=-1,
use_fast_math=False
+def tune_cutlass_function(
+ func,
+ use_3xtf32,
+ split_k_slices,
+ profile_all_alignments,
+ find_first_valid,
+ use_multiprocessing,
+ gemm_profiler,
+ conv2d_profiler,
):
- """Compile CUTLASS kernels in lib and return the runtime module ready to
run.
+ """Given a function intended to be offloaded to CUTLASS, profile each
workload to select which
+ kernels to emit.
Parameters
----------
- lib : GraphExecutorFactoryModule
- The output from relay.build containing compiled host code and
non-cutlass kernels.
+ func : IRModule
+ The Relay Function to tune for.
- sm : int
- An integer specifying the compute capability. For example, 75 for
Turing and
- 80 or 86 for Ampere.
+ use_3xtf32 : bool
+ Wheter or not use slower but very accurate (compared to tf32) 3xtf32
mode for
+ fp32 inputs on tensorcore.
- tmp_dir : string, optional
- A temporary directory where intermediate compiled artifacts will be
stored.
+ split_k_slices : list of int
+ Split factor candidates for split-K GEMM. If split-K > 1, the GEMM
K-loop is computed in
+ parallel accross split-K blocks, and a seperate global reduction
kernel is launched to
+ accumulate partial reductions. The profiler will pick the best split-k
factor from the
+ given candidate list. Note that the larger split-K factor requires a
larger workspace.
+ Currently, parallel split-k has been tested only for wgrad. For GEMM
and other conv2d
+ kinds, split_k_slices is ignored.
+
+ profile_all_alignments : bool
+ When True, profile all kernal variants with smaller alignments than
the largest possible.
- lib_path : string, optional
- The path to a shared library which will be generated as the result of
the build process.
+ find_first_valid : bool
+ Whether or not profile all candidate kernels, or stop profiling after
+ the first applicable kernel is found.
- threads : int, optional
- The number of threads to use for compiling generated kernels. Only
available for
- CUDA 11.2 or later. Use all physical cores by default.
+ use_multiprocessing : bool
+ Whether or not compile profiler executables for different kernels in
parallel.
+
+ gemm_profiler : CutlassGemmProfiler
+ Profiler for dense operators. May cache results between tuned
functions.
- use_fast_math : bool, optional
- Whether or not to use faster but less accurate math intrinsics.
+ conv2d_profiler : CutlassConv2DProfiler
+ Profiler for conv2d operators. May cach results between tuned
functions.
Returns
-------
- updated_lib : runtime.Module
- The updated module with compiled cutlass kernels.
+ annot_func : Function
+ The input function with attributes capturing the best CUTLASS kernel
found by tuning.
"""
- kwargs = _get_cutlass_compile_options(sm, threads, use_fast_math)
- lib.export_library(lib_path, workspace_dir=tmp_dir, **kwargs)
- return runtime.load_module(lib_path)
+ annotator = OpAnnotator()
+ annotator.visit(func)
+ out_shape = annotator.signature["ret_shape"]
+ out_dtype = annotator.signature["ret_dtype"]
+ op_type = annotator.signature["op_type"]
+
+ new_attrs = {"op_type": op_type}
+ new_attrs.update(annotator.signature)
+ new_attrs.update(func.attrs)
+ arg0_shape = new_attrs["arg0_shape"]
+ arg1_shape = new_attrs["arg1_shape"]
+ arg0_dtype = new_attrs["arg0_dtype"]
+ arg1_dtype = new_attrs["arg1_dtype"]
+
+ if "conv2d" in op_type:
+ new_attrs["padding"] = annotator.op_attrs.padding
+ new_attrs["strides"] = annotator.op_attrs.strides
+ new_attrs["dilation"] = annotator.op_attrs.dilation
+
+ if "conv2d_transpose" in op_type:
+ d_shape = out_shape
+ w_shape = arg1_shape
+ elif "conv2d_backward_weight" in op_type:
+ d_shape = arg1_shape
+ w_shape = out_shape
+ else:
+ d_shape = arg0_shape
+ w_shape = arg1_shape
+
+ new_attrs.update(
+ handle_conv2d(
+ conv2d_profiler,
+ op_type,
+ d_shape,
+ w_shape,
+ annotator.op_attrs.padding,
+ annotator.op_attrs.strides,
+ annotator.op_attrs.dilation,
+ out_dtype,
+ arg0_dtype,
+ arg1_dtype,
+ use_3xtf32,
+ split_k_slices,
+ profile_all_alignments,
+ find_first_valid,
+ use_multiprocessing,
+ )
+ )
+ elif "batch_matmul" in op_type:
+ new_attrs.update(
+ handle_batch_matmul(
+ gemm_profiler,
+ op_type,
+ arg0_shape,
+ arg1_shape,
+ out_dtype,
+ arg0_dtype,
+ arg1_dtype,
+ use_3xtf32,
+ find_first_valid,
+ use_multiprocessing,
+ )
+ )
+ elif "dense" in op_type:
+ new_attrs.update(
+ handle_dense(
+ gemm_profiler,
+ op_type,
+ arg0_shape,
+ arg1_shape,
+ out_dtype,
+ arg0_dtype,
+ arg1_dtype,
+ use_3xtf32,
+ find_first_valid,
+ use_multiprocessing,
+ )
+ )
+ else:
+ raise ValueError("%s unsupported composite" % op_type)
+
+ new_attrs = tvm.ir.make_node("DictAttrs", **new_attrs)
+ return relay.Function(
+ func.params,
+ func.body,
+ ret_type=func.ret_type,
+ type_params=func.type_params,
+ attrs=new_attrs,
+ )
-def build_cutlass_kernels_vm(
- vm_exec,
- sm,
- tmp_dir="./tmp",
- lib_path="compile.so",
- vmcode_path="vmcode.ro",
- threads=-1,
- use_fast_math=False,
-):
- """Compile CUTLASS kernels in vm_exec and return a VM executable ready to
run.
+@register_func("relay.ext.cutlass.compile_for_cutlass")
+def compile_for_cutlass(mod, cutlass_target):
+ """Given an IRModule with at least one Compiler='cutlass' Relay function,
return a
+ LibraryModule with all such functions compiled into their
PackedFunc-compatible form.
+ - First runs CUTLASS tuning to decide on the best kernels, which itself
requires the
+ repeated compilation and execution of CUDA code using nvcc. The results
of this
+ is captured as annotation on each relevant function. Kernel performance
is cached
+ overall all functions.
+ - Then generates a single CSourceModule containing C code implementing
all the
+ Compiler='cutlass' Relay functions, accounting for the tuning done
above.
+ - Then compiles that CSourceModule with the appropriate nvcc arguments to
yield
+ a static .o library. An export_library step will be required on the
final runtime
+ module to link that library into the overall .so library.
+ See CompileForCutlass in src/relay/backend/contrib/cutlass/codegen.cc for
where this
+ helper function is used to implement the RelayToTIR pass hook for
CUTLASS."""
+
+ # Recover options from the current 'cutlass' Target
+ assert cutlass_target.kind.name == "cutlass"
+ tuning_config = {
+ key: cutlass_target.attrs.get(key)
+ for key in [
+ "sm",
+ "use_3xtf32",
+ "split_k_slices",
+ "profile_all_alignments",
+ "find_first_valid",
+ "use_multiprocessing",
+ ]
+ }
+ compile_config = {
+ key: cutlass_target.attrs.get(key) for key in ["sm", "threads",
"use_fast_math"]
+ }
+ tmp_dir = cutlass_target.attrs.get("tmp_dir")
+
+ # Tune
+ logger.info("Tuning for CUTLASS")
+ mod, _ = tune_cutlass_kernels(mod, tmp_dir=tmp_dir, **tuning_config)
+
+ # Compile
+ logger.info("Creating CSource module for CUTLASS")
+ create_c_source_module =
tvm._ffi.get_global_func("relay.ext.cutlass.create_c_source_module")
+ c_module = create_c_source_module(mod)
+ function_names = c_module.get_function("get_func_names")()
+ compile_options = _get_cutlass_compile_options(**compile_config)
+ lib_path = os.path.join(tmp_dir, "cutlass.o")
+ logger.info("Compiling generated CUTLASS code")
+ c_module.export_library(lib_path, workspace_dir=tmp_dir, **compile_options)
+
+ # Recover static library
+ logger.info("Loading compiled CUTLASS code")
+ final_mod = tvm.runtime.load_static_library(lib_path, function_names)
+
+ logger.info("Done with CUTLASS compilation")
+ return final_mod
+
+
+def finalize_modules(lib, lib_path, tmp_dir):
Review Comment:
Please restore the default arguments for `lib_path` and `tmp_dir`.
##########
python/tvm/contrib/cutlass/build.py:
##########
@@ -346,187 +357,271 @@ def tune_cutlass_kernels(
for var in mod.get_global_vars():
fun_name = var.name_hint
func = mod[fun_name]
- annotator = OpAnnotator()
if "cutlass" in fun_name:
num_cutlass_partition += 1
- annotator.visit(func)
- out_shape = annotator.signature["ret_shape"]
- out_dtype = annotator.signature["ret_dtype"]
- op_type = annotator.signature["op_type"]
-
- new_attrs = {"op_type": op_type}
- new_attrs.update(annotator.signature)
- new_attrs.update(func.attrs)
- arg0_shape = new_attrs["arg0_shape"]
- arg1_shape = new_attrs["arg1_shape"]
- arg0_dtype = new_attrs["arg0_dtype"]
- arg1_dtype = new_attrs["arg1_dtype"]
-
- if "conv2d" in op_type:
- new_attrs["padding"] = annotator.op_attrs.padding
- new_attrs["strides"] = annotator.op_attrs.strides
- new_attrs["dilation"] = annotator.op_attrs.dilation
-
- if "conv2d_transpose" in op_type:
- d_shape = out_shape
- w_shape = arg1_shape
- elif "conv2d_backward_weight" in op_type:
- d_shape = arg1_shape
- w_shape = out_shape
- else:
- d_shape = arg0_shape
- w_shape = arg1_shape
-
- new_attrs.update(
- handle_conv2d(
- conv2d_profiler,
- op_type,
- d_shape,
- w_shape,
- annotator.op_attrs.padding,
- annotator.op_attrs.strides,
- annotator.op_attrs.dilation,
- out_dtype,
- arg0_dtype,
- arg1_dtype,
- use_3xtf32,
- split_k_slices,
- profile_all_alignments,
- find_first_valid,
- use_multiprocessing,
- )
- )
- elif "batch_matmul" in op_type:
- new_attrs.update(
- handle_batch_matmul(
- gemm_profiler,
- op_type,
- arg0_shape,
- arg1_shape,
- out_dtype,
- arg0_dtype,
- arg1_dtype,
- use_3xtf32,
- find_first_valid,
- use_multiprocessing,
- )
- )
- elif "dense" in op_type:
- new_attrs.update(
- handle_dense(
- gemm_profiler,
- op_type,
- arg0_shape,
- arg1_shape,
- out_dtype,
- arg0_dtype,
- arg1_dtype,
- use_3xtf32,
- find_first_valid,
- use_multiprocessing,
- )
- )
- else:
- raise ValueError("%s unsupported composite" % op_type)
-
- new_attrs = tvm.ir.make_node("DictAttrs", **new_attrs)
- new_func = relay.Function(
- func.params,
- func.body,
- ret_type=func.ret_type,
- type_params=func.type_params,
- attrs=new_attrs,
+ new_func = tune_cutlass_function(
+ func,
+ use_3xtf32,
+ split_k_slices,
+ profile_all_alignments,
+ find_first_valid,
+ use_multiprocessing,
+ gemm_profiler,
+ conv2d_profiler,
)
mod.update_func(var, new_func)
return mod, num_cutlass_partition
-def build_cutlass_kernels(
- lib, sm, tmp_dir="./tmp", lib_path="compile.so", threads=-1,
use_fast_math=False
+def tune_cutlass_function(
+ func,
+ use_3xtf32,
+ split_k_slices,
+ profile_all_alignments,
+ find_first_valid,
+ use_multiprocessing,
+ gemm_profiler,
+ conv2d_profiler,
):
- """Compile CUTLASS kernels in lib and return the runtime module ready to
run.
+ """Given a function intended to be offloaded to CUTLASS, profile each
workload to select which
+ kernels to emit.
Parameters
----------
- lib : GraphExecutorFactoryModule
- The output from relay.build containing compiled host code and
non-cutlass kernels.
+ func : IRModule
+ The Relay Function to tune for.
- sm : int
- An integer specifying the compute capability. For example, 75 for
Turing and
- 80 or 86 for Ampere.
+ use_3xtf32 : bool
+ Wheter or not use slower but very accurate (compared to tf32) 3xtf32
mode for
+ fp32 inputs on tensorcore.
- tmp_dir : string, optional
- A temporary directory where intermediate compiled artifacts will be
stored.
+ split_k_slices : list of int
+ Split factor candidates for split-K GEMM. If split-K > 1, the GEMM
K-loop is computed in
+ parallel accross split-K blocks, and a seperate global reduction
kernel is launched to
+ accumulate partial reductions. The profiler will pick the best split-k
factor from the
+ given candidate list. Note that the larger split-K factor requires a
larger workspace.
+ Currently, parallel split-k has been tested only for wgrad. For GEMM
and other conv2d
+ kinds, split_k_slices is ignored.
+
+ profile_all_alignments : bool
+ When True, profile all kernal variants with smaller alignments than
the largest possible.
- lib_path : string, optional
- The path to a shared library which will be generated as the result of
the build process.
+ find_first_valid : bool
+ Whether or not profile all candidate kernels, or stop profiling after
+ the first applicable kernel is found.
- threads : int, optional
- The number of threads to use for compiling generated kernels. Only
available for
- CUDA 11.2 or later. Use all physical cores by default.
+ use_multiprocessing : bool
+ Whether or not compile profiler executables for different kernels in
parallel.
+
+ gemm_profiler : CutlassGemmProfiler
+ Profiler for dense operators. May cache results between tuned
functions.
- use_fast_math : bool, optional
- Whether or not to use faster but less accurate math intrinsics.
+ conv2d_profiler : CutlassConv2DProfiler
+ Profiler for conv2d operators. May cach results between tuned
functions.
Returns
-------
- updated_lib : runtime.Module
- The updated module with compiled cutlass kernels.
+ annot_func : Function
+ The input function with attributes capturing the best CUTLASS kernel
found by tuning.
"""
- kwargs = _get_cutlass_compile_options(sm, threads, use_fast_math)
- lib.export_library(lib_path, workspace_dir=tmp_dir, **kwargs)
- return runtime.load_module(lib_path)
+ annotator = OpAnnotator()
+ annotator.visit(func)
+ out_shape = annotator.signature["ret_shape"]
+ out_dtype = annotator.signature["ret_dtype"]
+ op_type = annotator.signature["op_type"]
+
+ new_attrs = {"op_type": op_type}
+ new_attrs.update(annotator.signature)
+ new_attrs.update(func.attrs)
+ arg0_shape = new_attrs["arg0_shape"]
+ arg1_shape = new_attrs["arg1_shape"]
+ arg0_dtype = new_attrs["arg0_dtype"]
+ arg1_dtype = new_attrs["arg1_dtype"]
+
+ if "conv2d" in op_type:
+ new_attrs["padding"] = annotator.op_attrs.padding
+ new_attrs["strides"] = annotator.op_attrs.strides
+ new_attrs["dilation"] = annotator.op_attrs.dilation
+
+ if "conv2d_transpose" in op_type:
+ d_shape = out_shape
+ w_shape = arg1_shape
+ elif "conv2d_backward_weight" in op_type:
+ d_shape = arg1_shape
+ w_shape = out_shape
+ else:
+ d_shape = arg0_shape
+ w_shape = arg1_shape
+
+ new_attrs.update(
+ handle_conv2d(
+ conv2d_profiler,
+ op_type,
+ d_shape,
+ w_shape,
+ annotator.op_attrs.padding,
+ annotator.op_attrs.strides,
+ annotator.op_attrs.dilation,
+ out_dtype,
+ arg0_dtype,
+ arg1_dtype,
+ use_3xtf32,
+ split_k_slices,
+ profile_all_alignments,
+ find_first_valid,
+ use_multiprocessing,
+ )
+ )
+ elif "batch_matmul" in op_type:
+ new_attrs.update(
+ handle_batch_matmul(
+ gemm_profiler,
+ op_type,
+ arg0_shape,
+ arg1_shape,
+ out_dtype,
+ arg0_dtype,
+ arg1_dtype,
+ use_3xtf32,
+ find_first_valid,
+ use_multiprocessing,
+ )
+ )
+ elif "dense" in op_type:
+ new_attrs.update(
+ handle_dense(
+ gemm_profiler,
+ op_type,
+ arg0_shape,
+ arg1_shape,
+ out_dtype,
+ arg0_dtype,
+ arg1_dtype,
+ use_3xtf32,
+ find_first_valid,
+ use_multiprocessing,
+ )
+ )
+ else:
+ raise ValueError("%s unsupported composite" % op_type)
+
+ new_attrs = tvm.ir.make_node("DictAttrs", **new_attrs)
+ return relay.Function(
+ func.params,
+ func.body,
+ ret_type=func.ret_type,
+ type_params=func.type_params,
+ attrs=new_attrs,
+ )
-def build_cutlass_kernels_vm(
- vm_exec,
- sm,
- tmp_dir="./tmp",
- lib_path="compile.so",
- vmcode_path="vmcode.ro",
- threads=-1,
- use_fast_math=False,
-):
- """Compile CUTLASS kernels in vm_exec and return a VM executable ready to
run.
+@register_func("relay.ext.cutlass.compile_for_cutlass")
+def compile_for_cutlass(mod, cutlass_target):
+ """Given an IRModule with at least one Compiler='cutlass' Relay function,
return a
+ LibraryModule with all such functions compiled into their
PackedFunc-compatible form.
+ - First runs CUTLASS tuning to decide on the best kernels, which itself
requires the
+ repeated compilation and execution of CUDA code using nvcc. The results
of this
+ is captured as annotation on each relevant function. Kernel performance
is cached
+ overall all functions.
+ - Then generates a single CSourceModule containing C code implementing
all the
+ Compiler='cutlass' Relay functions, accounting for the tuning done
above.
+ - Then compiles that CSourceModule with the appropriate nvcc arguments to
yield
+ a static .o library. An export_library step will be required on the
final runtime
+ module to link that library into the overall .so library.
+ See CompileForCutlass in src/relay/backend/contrib/cutlass/codegen.cc for
where this
+ helper function is used to implement the RelayToTIR pass hook for
CUTLASS."""
+
+ # Recover options from the current 'cutlass' Target
+ assert cutlass_target.kind.name == "cutlass"
+ tuning_config = {
+ key: cutlass_target.attrs.get(key)
+ for key in [
+ "sm",
+ "use_3xtf32",
+ "split_k_slices",
+ "profile_all_alignments",
+ "find_first_valid",
+ "use_multiprocessing",
+ ]
+ }
+ compile_config = {
+ key: cutlass_target.attrs.get(key) for key in ["sm", "threads",
"use_fast_math"]
+ }
+ tmp_dir = cutlass_target.attrs.get("tmp_dir")
+
+ # Tune
+ logger.info("Tuning for CUTLASS")
+ mod, _ = tune_cutlass_kernels(mod, tmp_dir=tmp_dir, **tuning_config)
+
+ # Compile
+ logger.info("Creating CSource module for CUTLASS")
+ create_c_source_module =
tvm._ffi.get_global_func("relay.ext.cutlass.create_c_source_module")
+ c_module = create_c_source_module(mod)
+ function_names = c_module.get_function("get_func_names")()
+ compile_options = _get_cutlass_compile_options(**compile_config)
+ lib_path = os.path.join(tmp_dir, "cutlass.o")
+ logger.info("Compiling generated CUTLASS code")
+ c_module.export_library(lib_path, workspace_dir=tmp_dir, **compile_options)
+
+ # Recover static library
+ logger.info("Loading compiled CUTLASS code")
+ final_mod = tvm.runtime.load_static_library(lib_path, function_names)
+
+ logger.info("Done with CUTLASS compilation")
+ return final_mod
+
+
+def finalize_modules(lib, lib_path, tmp_dir):
+ """Returns lib with any C source, LLVM and static library modules complied
and linked in ready
+ for use by the graph or AOT executors. This method is not specific to
CUTLASS, however it does
+ assume nvcc will be used for final compilation and linking. It is provided
here for
+ convenience.
Parameters
----------
- vm_exec : vm.Executable
- The output from relay.vm.compile containing compiled host code and
non-cutlass kernels.
+ lib : runtime.Module
+ The output from relay.build.
- sm : int
- An integer specifying the compute capability. For example, 75 for
Turing and
- 80 or 86 for Ampere.
+ lib_path : string
+ Name for temporary library .so file.
- tmp_dir : string, optional
- A temporary directory where intermediate compiled artifacts will be
stored.
+ tmp_dir : Working temporary directory.
+
+ Returns
+ -------
+ updated_lib : runtime::Module
+ The given lib with any final compilation and linking steps completed.
+
+ """
+ lib_path = os.path.join(tmp_dir, lib_path)
+ lib.export_library(lib_path, workspace_dir=tmp_dir, cc="nvcc")
+ return runtime.load_module(lib_path)
- lib_path : string, optional
- The path to a shared library which will be generated as the result of
the build process.
- vmcode_path : string, optional
- The path where the VM bytecode will be serialized to.
+def finalize_modules_vm(vm_exec, lib_path, tmp_dir):
Review Comment:
Please restore the default arguments for `lib_path` and `tmp_dir`. Also,
`vmcode_path` needs to be provided, to allow loading a pre-compiled model for
VM.
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