mbaret commented on a change in pull request #9214:
URL: https://github.com/apache/tvm/pull/9214#discussion_r759213453



##########
File path: tests/python/unittest/test_tir_usmp_algo.py
##########
@@ -0,0 +1,492 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+import pytest
+
+import tvm
+from tvm import tir, script
+from tvm.script import tir as T
+from tvm.tir import stmt_functor
+from tvm.tir.usmp import utils as usmp_utils
+from tvm.target import Target
+
+
+def _replace_stmt_with_buf_var_names(buffer_info_map):
+    """helper to replace tir.allocates with buffer names"""
+    new_buffer_info_map = dict()
+    for k, v in buffer_info_map.items():
+        new_buffer_info_map[v.buffer_var.name] = k
+    return new_buffer_info_map
+
+
+def _verify_conflicts(main_buf_name, conflicting_buf_names, buffer_info_map):
+    """helper to check expected liveness conflicts"""
+    buf_info = buffer_info_map[main_buf_name]
+    for conflict in buf_info.conflicts:
+        assert conflict.name_hint in conflicting_buf_names
+
+
+def _get_allocates(primfunc):
+    """helper to extract all allocate nodes by name"""
+    allocates = dict()
+
+    def get_allocate(stmt):
+        if isinstance(stmt, tvm.tir.Allocate):
+            allocates[str(stmt.buffer_var.name)] = stmt
+
+    stmt_functor.post_order_visit(primfunc.body, get_allocate)
+    return allocates
+
+
+def assign_poolinfos_to_allocates_in_primfunc(primfunc, pool_infos):
+    """helper to assing poolinfos to allocate nodes in a tir.PrimFunc"""
+
+    def set_poolinfos(stmt):
+        if isinstance(stmt, tvm.tir.Allocate):
+            return tvm.tir.Allocate(
+                buffer_var=stmt.buffer_var,
+                dtype=stmt.dtype,
+                extents=stmt.extents,
+                condition=stmt.condition,
+                body=stmt.body,
+                annotations={tvm.tir.usmp.utils.CANDIDATE_MEMORY_POOL_ATTR: 
pool_infos},
+            )
+
+    return primfunc.with_body(stmt_functor.ir_transform(primfunc.body, None, 
set_poolinfos))
+
+
+def assign_poolinfos_to_allocates_in_irmodule(mod, pool_infos):
+    """helper to assing poolinfos to allocate nodes in a IRModule"""
+    ret = tvm.IRModule()
+    for global_var, basefunc in mod.functions.items():
+        if isinstance(basefunc, tvm.tir.PrimFunc):
+            ret[global_var] = 
assign_poolinfos_to_allocates_in_primfunc(basefunc, pool_infos)
+    return ret
+
+
+def _assign_targets_to_primfuncs_irmodule(mod, target):
+    """helper to assign target for PrimFunc in a IRModule"""
+    ret = tvm.IRModule()
+    for global_var, basefunc in mod.functions.items():
+        if isinstance(basefunc, tvm.tir.PrimFunc):
+            ret[global_var] = basefunc.with_attr("target", target)
+    return ret
+
+
+def _check_max_workspace_size(buffer_pool_allocations, pool_info, size):
+    max_workspace_size = 0
+    for buffer_info, pool_allocation in buffer_pool_allocations.items():
+        if pool_allocation.pool_info == pool_info:
+            size_candidate = pool_allocation.byte_offset + 
buffer_info.size_bytes
+            if size_candidate > max_workspace_size:
+                max_workspace_size = size_candidate
+    assert max_workspace_size == size
+
+
+# fmt: off
[email protected]_module
+class LinearStructure:
+    @T.prim_func
+    def tvmgen_default_fused_cast_subtract(placeholder_2: T.handle, 
placeholder_3: T.handle, T_subtract: T.handle) -> None:
+        # function attr dict
+        T.func_attr({"global_symbol": "tvmgen_default_fused_cast_subtract", 
"tir.noalias": True})
+        placeholder_4 = T.match_buffer(placeholder_2, [1, 224, 224, 3], 
dtype="uint8", elem_offset=0, align=128, offset_factor=1)
+        placeholder_5 = T.match_buffer(placeholder_3, [], dtype="int16", 
elem_offset=0, align=128, offset_factor=1)
+        T_subtract_1 = T.match_buffer(T_subtract, [1, 224, 224, 3], 
dtype="int16", elem_offset=0, align=128, offset_factor=1)
+        # body
+        for ax0_ax1_fused_1 in T.serial(0, 224):
+            for ax2_1, ax3_inner_1 in T.grid(224, 3):
+                T.store(T_subtract_1.data, (((ax0_ax1_fused_1*672) + 
(ax2_1*3)) + ax3_inner_1), (T.cast(T.load("uint8", placeholder_4.data, 
(((ax0_ax1_fused_1*672) + (ax2_1*3)) + ax3_inner_1)), "int16") - 
T.load("int16", placeholder_5.data, 0)), True)
+
+    @T.prim_func
+    def 
tvmgen_default_fused_nn_conv2d_add_fixed_point_multiply_clip_cast(placeholder_62:
 T.handle, placeholder_63: T.handle, placeholder_64: T.handle, T_cast_20: 
T.handle) -> None:
+        # function attr dict
+        T.func_attr({"global_symbol": 
"tvmgen_default_fused_nn_conv2d_add_fixed_point_multiply_clip_cast", 
"tir.noalias": True})
+        placeholder_65 = T.match_buffer(placeholder_62, [1, 224, 224, 3], 
dtype="int16", elem_offset=0, align=128, offset_factor=1)
+        placeholder_66 = T.match_buffer(placeholder_63, [7, 7, 3, 64], 
dtype="int16", elem_offset=0, align=128, offset_factor=1)
+        placeholder_67 = T.match_buffer(placeholder_64, [1, 1, 1, 64], 
dtype="int32", elem_offset=0, align=128, offset_factor=1)
+        T_cast_21 = T.match_buffer(T_cast_20, [1, 112, 112, 64], 
dtype="uint8", elem_offset=0, align=128, offset_factor=1)
+        # body
+        PaddedInput_7 = T.allocate([157323], "int16", "global")
+        for i0_i1_fused_7 in T.serial(0, 229):
+            for i2_7, i3_7 in T.grid(229, 3):
+                T.store(PaddedInput_7, (((i0_i1_fused_7*687) + (i2_7*3)) + 
i3_7), T.if_then_else(((((2 <= i0_i1_fused_7) and (i0_i1_fused_7 < 226)) and (2 
<= i2_7)) and (i2_7 < 226)), T.load("int16", placeholder_65.data, 
((((i0_i1_fused_7*672) + (i2_7*3)) + i3_7) - 1350)), T.int16(0), 
dtype="int16"), True)
+        for ax0_ax1_fused_ax2_fused_7 in T.serial(0, 12544):
+            Conv2dOutput_7 = T.allocate([64], "int32", "global")
+            for ff_3 in T.serial(0, 64):
+                T.store(Conv2dOutput_7, ff_3, 0, True)
+                for ry_2, rx_2, rc_7 in T.grid(7, 7, 3):
+                    T.store(Conv2dOutput_7, ff_3, (T.load("int32", 
Conv2dOutput_7, ff_3) + (T.cast(T.load("int16", PaddedInput_7, 
(((((T.floordiv(ax0_ax1_fused_ax2_fused_7, 112)*1374) + (ry_2*687)) + 
(T.floormod(ax0_ax1_fused_ax2_fused_7, 112)*6)) + (rx_2*3)) + rc_7)), 
"int32")*T.cast(T.load("int16", placeholder_66.data, ((((ry_2*1344) + 
(rx_2*192)) + (rc_7*64)) + ff_3)), "int32"))), True)
+            for ax3_inner_7 in T.serial(0, 64):
+                T.store(T_cast_21.data, ((ax0_ax1_fused_ax2_fused_7*64) + 
ax3_inner_7), T.cast(T.max(T.min(T.q_multiply_shift((T.load("int32", 
Conv2dOutput_7, ax3_inner_7) + T.load("int32", placeholder_67.data, 
ax3_inner_7)), 1939887962, 31, -9, dtype="int32"), 255), 0), "uint8"), True)
+
+    @T.prim_func
+    def tvmgen_default_fused_nn_max_pool2d_cast(placeholder_28: T.handle, 
T_cast_6: T.handle) -> None:
+        # function attr dict
+        T.func_attr({"global_symbol": 
"tvmgen_default_fused_nn_max_pool2d_cast", "tir.noalias": True})
+        placeholder_29 = T.match_buffer(placeholder_28, [1, 112, 112, 64], 
dtype="uint8", elem_offset=0, align=128, offset_factor=1)
+        T_cast_7 = T.match_buffer(T_cast_6, [1, 56, 56, 64], dtype="int16", 
elem_offset=0, align=128, offset_factor=1)
+        # body
+        tensor_2 = T.allocate([200704], "uint8", "global")
+        for ax0_ax1_fused_4 in T.serial(0, 56):
+            for ax2_4 in T.serial(0, 56):
+                for ax3_init in T.serial(0, 64):
+                    T.store(tensor_2, (((ax0_ax1_fused_4*3584) + (ax2_4*64)) + 
ax3_init), T.uint8(0), True)
+                for rv0_rv1_fused_1, ax3_2 in T.grid(9, 64):
+                    T.store(tensor_2, (((ax0_ax1_fused_4*3584) + (ax2_4*64)) + 
ax3_2), T.max(T.load("uint8", tensor_2, (((ax0_ax1_fused_4*3584) + (ax2_4*64)) 
+ ax3_2)), T.if_then_else(((((ax0_ax1_fused_4*2) + T.floordiv(rv0_rv1_fused_1, 
3)) < 112) and (((ax2_4*2) + T.floormod(rv0_rv1_fused_1, 3)) < 112)), 
T.load("uint8", placeholder_29.data, (((((ax0_ax1_fused_4*14336) + 
(T.floordiv(rv0_rv1_fused_1, 3)*7168)) + (ax2_4*128)) + 
(T.floormod(rv0_rv1_fused_1, 3)*64)) + ax3_2)), T.uint8(0), dtype="uint8")), 
True)
+        for ax0_ax1_fused_5 in T.serial(0, 56):
+            for ax2_5, ax3_3 in T.grid(56, 64):
+                T.store(T_cast_7.data, (((ax0_ax1_fused_5*3584) + (ax2_5*64)) 
+ ax3_3), T.cast(T.load("uint8", tensor_2, (((ax0_ax1_fused_5*3584) + 
(ax2_5*64)) + ax3_3)), "int16"), True)
+
+    @T.prim_func
+    def run_model(input: T.handle, output: T.handle) -> None:
+        # function attr dict
+        T.func_attr({"global_symbol": "tvmgen_default_run_model", 
"runner_function": True})
+        # body
+        T.attr("default", "device_id", 0)
+        T.attr("default", "device_type", 1)
+        sid_9 = T.allocate([301056], "int8", "global")
+        sid_8 = T.allocate([802816], "int8", "global")
+        T.evaluate(T.call_extern("tvmgen_default_fused_cast_subtract", input, 
T.lookup_param("p0", dtype="handle"), sid_9, dtype="int32"))
+        
T.evaluate(T.call_extern("tvmgen_default_fused_nn_conv2d_add_fixed_point_multiply_clip_cast",
 sid_9, T.lookup_param("p1", dtype="handle"), T.lookup_param("p2", 
dtype="handle"), sid_8, dtype="int32"))
+        T.evaluate(T.call_extern("tvmgen_default_fused_nn_max_pool2d_cast", 
sid_8, output, dtype="int32"))
+    __tvm_meta__ = None
+# fmt: on
+
+
+def print_conflicts(buffer_info_map):
+    """_verify_conflicts("sid_8", ["Conv2dOutput_7", "tensor_2"], 
buffer_info_map)"""
+
+    for buffer_info_name, buf_info in buffer_info_map.items():
+        conflict_str = "["
+        for conflict in buf_info.conflicts:
+            conflict_str += f'"{conflict.name_hint}", '
+        conflict_str += "]"
+        print(f'_verify_conflicts("{buffer_info_name}", {conflict_str}, 
buffer_info_map_names)')
+
+
[email protected](
+    ["algorithm", "fast_memory_size", "slow_memory_size"],
+    [("greedy_by_size", 200704, 1418528), ("greedy_by_conflicts", 200704, 
1418528)],
+)
+def test_linear(algorithm, fast_memory_size, slow_memory_size):
+    target = Target("c")
+    fast_memory_pool = usmp_utils.PoolInfo(
+        pool_name="fast_memory",
+        target_access={target: usmp_utils.PoolInfo.READ_WRITE_ACCESS},
+        size_hint_bytes=200704,
+    )
+    slow_memory_pool = usmp_utils.PoolInfo(
+        pool_name="slow_memory", target_access={target: 
usmp_utils.PoolInfo.READ_WRITE_ACCESS}
+    )
+    tir_mod = LinearStructure
+    tir_mod = _assign_targets_to_primfuncs_irmodule(tir_mod, target)
+    tir_mod = assign_poolinfos_to_allocates_in_irmodule(
+        tir_mod, [fast_memory_pool, slow_memory_pool]
+    )
+    main_func = tir_mod["run_model"]
+    buffer_info_map = tvm.tir.usmp.analysis.extract_buffer_info(main_func, 
tir_mod)
+
+    fcreate_array_bi = tvm.get_global_func("tir.usmp.CreateArrayBufferInfo")
+    buffer_info_arr = fcreate_array_bi(buffer_info_map)
+    fusmp_algo_greedy_by_size = 
tvm.get_global_func(f"tir.usmp.algo.{algorithm}")
+    buffer_pool_allocations = fusmp_algo_greedy_by_size(buffer_info_arr)
+
+    buffer_info_map_names = dict()
+    for buf_info in buffer_info_arr:
+        buffer_info_map_names[buf_info.name_hint] = buf_info
+
+    # check conflicts
+    _verify_conflicts("PaddedInput_7", ["sid_9", "sid_8", "Conv2dOutput_7"], 
buffer_info_map_names)
+    _verify_conflicts("tensor_2", ["sid_8"], buffer_info_map_names)
+    _verify_conflicts("sid_9", ["PaddedInput_7"], buffer_info_map_names)
+    _verify_conflicts(
+        "sid_8", ["PaddedInput_7", "Conv2dOutput_7", "tensor_2"], 
buffer_info_map_names
+    )
+    _verify_conflicts("Conv2dOutput_7", ["sid_8", "PaddedInput_7"], 
buffer_info_map_names)
+
+    _check_max_workspace_size(buffer_pool_allocations, slow_memory_pool, 
slow_memory_size)
+    _check_max_workspace_size(buffer_pool_allocations, fast_memory_pool, 
fast_memory_size)
+
+
+# fmt: off
[email protected]_module
+class ResnetStructure:

Review comment:
       Well ResNet has padded convolutions and heavily fused kernels in it with 
weird names. This makes it quite hard to read - for me at least - and I don't 
think that complexity enhances a test of fan-out behaviour. It would seem that 
to test fan-out all we strictly need is a couple of simple elementwise 
operations that read from the same tensor. I think this test still has merit 
(to test a more complex 'real' case), but probably needs naming as such (i.e. 
test_resnet_subgraph).




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