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import tvm | |
from tvm import relay | |
from tvm.contrib.download import download_testdata | |
from tvm.driver import tvmc | |
from tvm.relay.backend import Runtime, Executor | |
from tvm.relay.backend.contrib.uma import UMABackend | |
from tvm.relay.backend.contrib.uma.api.utils import PassPhase | |
from tvm.relay.dataflow_pattern import is_op, wildcard, is_constant | |
from tvm.target import Target | |
from tvm.tir.transform import PrimFuncPass | |
def qnn_conv2d_pattern(): | |
dtype = "int8" | |
return is_op("qnn.conv2d")( | |
wildcard().has_dtype(dtype), | |
wildcard().has_dtype(dtype), | |
is_constant(), | |
is_constant(), | |
is_constant(), | |
is_constant(), | |
) | |
@tvm.tir.transform.prim_func_pass(opt_level=2) | |
class VanillaPass(PrimFuncPass): | |
_EXTERNAL_FUNCTION_NAME = "my_ai_hw_conv2dnchw" | |
_TVM_BLOCK_MATCH_NAME = "conv2d_nchw" | |
def transform_function( | |
self, | |
func: tvm.tir.PrimFunc, | |
mod: tvm.ir.IRModule, | |
ctx: tvm.ir.transform.PassContext, | |
) -> tvm.tir.PrimFunc: | |
return self._my_ai_hw_conv2d_pass(func, mod, ctx) | |
@classmethod | |
def _my_ai_hw_conv2d_pass(cls, func, mod, ctx): | |
_loops = dict() | |
_handles = [] | |
_entry_node = None | |
def _has_block(name: str, func: tvm.tir.PrimFunc) -> bool: | |
""" | |
Determine of a tir.block with `name` exists in `func` | |
""" | |
def _hb(op): | |
if isinstance(op, tvm.tir.Block): | |
_found_blocks.append(op.name_hint) | |
_found_blocks = [] | |
tvm.tir.stmt_functor.post_order_visit(func.body, _hb) | |
return name in _found_blocks | |
def _detect_and_replace_conv2d( | |
func: tvm.tir.PrimFunc, | |
_mod: tvm.ir.IRModule, | |
_ctx: tvm.ir.transform.PassContext, | |
) -> tvm.tir.PrimFunc: | |
def _replace_conv2d(op): | |
if op == _entry_node: | |
irb = tvm.tir.ir_builder.create() | |
# Collection of buffer address | |
buffers = [b[1].data for b in _handles] | |
# extraction of loop offsets | |
for k, v in _loops.items(): | |
assert v.min.value == 0 | |
offset_order = ["co", "w", "h", "ci", "kh", "kw"] | |
offsets = [_loops[i].extent.value for i in offset_order] | |
args = buffers + offsets | |
irb.emit(tir_call(irb, True, cls._EXTERNAL_FUNCTION_NAME, *args)) | |
irb_result = irb.get() | |
return irb_result | |
elif isinstance(op, tvm.tir.SeqStmt): | |
# Remove that pad block of TOPI's conv2DNCHW by only returning the 2nd statement | |
return op.seq[1] | |
return op | |
sch = tvm.tir.Schedule(func) | |
if _has_block(cls._TVM_BLOCK_MATCH_NAME, func): | |
conv2d_block = sch.get_block(cls._TVM_BLOCK_MATCH_NAME) | |
rv_loops = sch.get_loops(conv2d_block) | |
assert len(rv_loops) == 7 | |
loops = dict( | |
n=rv_loops[0], | |
co=rv_loops[1], | |
h=rv_loops[2], | |
w=rv_loops[3], | |
ci=rv_loops[4], | |
kh=rv_loops[5], | |
kw=rv_loops[6], | |
) | |
_entry_node = sch.get(rv_loops[1]) | |
_loops = {k: sch.get(v) for k, v in loops.items()} | |
_handles = func.buffer_map.items() | |
x = tvm.tir.stmt_functor.ir_transform( | |
func.body, None, _replace_conv2d, ["tir.For", "tir.SeqStmt"] | |
) | |
return func.with_body(x) | |
else: | |
return func | |
r = _detect_and_replace_conv2d(func, mod, ctx) | |
return r | |
def tir_call(ib: tvm.tir.ir_builder, extern: bool, name: str, *args): | |
""" | |
ib: ir_builder | |
extern: bool | |
True --> tvm.tir.call_extern | |
False --> tvm.tir.call_packed | |
name: str | |
function name | |
*args: | |
arguments for function call | |
""" | |
def buf_from_array(ib, arr, dtype): | |
# Allocate enough memory to store the whole array | |
var = ib.allocate("int32", (len(arr),), scope="global") | |
for i, v in enumerate(arr): | |
var[i] = v | |
# Declare a buffer, which is basically a view on the chunk of memory that we allocated | |
buf = tvm.tir.decl_buffer((len(arr),), dtype, data=var, scope="global") | |
return buf | |
if extern: | |
args = [i.data if isinstance(i, tvm.tir.Buffer) else i for i in args] | |
return tvm.tir.call_extern("int32", name, *args) | |
else: | |
args = [ | |
buf_from_array(ib, i, "int32") | |
if isinstance(i, (tuple, list, tvm.ir.container.Array)) | |
else i | |
for i in args | |
] | |
return tvm.tir.call_packed(name, *args) | |
@relay.op.strategy.override_native_generic_func("custom_conv2d_strategy") | |
def custom_conv2d_strategy(attrs, inputs, out_type, target): | |
return relay.op.strategy.generic.conv2d_strategy( | |
attrs, inputs[:2], out_type, target | |
) | |
class VanillaAcceleratorBackend(UMABackend): | |
"""UMA backend for the VanillaAccelerator accelerator.""" | |
def __init__(self): | |
super().__init__() | |
self._register_pattern("qnn_conv2d", qnn_conv2d_pattern()) | |
self._register_operator_strategy("qnn.conv2d", custom_conv2d_strategy) | |
self._register_tir_pass(PassPhase.TIR_PHASE_0, VanillaPass()) | |
self._register_codegen( | |
fmt="c", includes=lambda: '#include "doesntmatter/conv2dnchw.cc"' | |
) | |
@property | |
def target_name(self): | |
return "vanilla_accelerator" | |
def test_vanilla(): | |
tflite_path = download_testdata( | |
"https://github.com/mlcommons/tiny/raw/master" | |
"/benchmark/training/visual_wake_words/trained_models/vww_96_int8.tflite", | |
"model.tflite", | |
) | |
tvmc_model = tvmc.load(str(tflite_path)) | |
uma_backend = VanillaAcceleratorBackend() | |
uma_backend.register() | |
ir_module = uma_backend.partition(tvmc_model.mod, tvmc_model.params) | |
c_target = Target("c") | |
vanilla_target = Target(uma_backend.target_name, host=c_target) | |
eventual_target = [c_target, vanilla_target] | |
tvm.relay.build( | |
ir_module, | |
target=eventual_target, | |
params=tvmc_model.params, | |
runtime=Runtime("crt", {"system-lib": False}), | |
executor=Executor("aot", {"unpacked-api": True, "interface-api": "c"}), | |
), |
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