[TOPI] [Hexagon] Batch flatten slice op initial version (apache#11522)

* [TOPI] [Hexagon] Batch flatten slice op initial version

* Fix lint errors

* Fix more lint errors

* Fix lint warnings

* Fix review comments

* Update tests to use util functions

* Update __init__.py

* Fix review comments

python/tvm/topi/hexagon/slice_ops/__init__.py

@@ -20,5 +20,6 @@
 from .avg_pool2d import avg_pool2d_compute, avg_pool2d_STIR_schedule
 from .add_subtract_multiply import *
 from .argmax import argmax_compute, argmax_schedule
+from .batch_flatten import batch_flatten_compute, batch_flatten_stir_schedule
 from .softmax_slice import *
 from .clip import *

python/tvm/topi/hexagon/slice_ops/batch_flatten.py

@@ -0,0 +1,77 @@
+# 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.
+
+"""Hexagon slice batch flatten compute and schedule"""
+from tvm import te, tir, topi
+from ..utils import get_layout_transform_fn
+
+
+def batch_flatten_compute(inp: te.Tensor) -> te.Tensor:
+    """Compute for slice batch flatten op for hexagon.
+    This op makes the following assumptions:
+    1. This op is written for a sliced batch flatten operation.
+    2. The input is assumed to be in NHWC layout.
+
+    Parameters
+    ----------
+    Input : te.Tensor
+        Input activations padded for inner dimension size
+    Returns
+    -------
+    Output : te.Tensor
+        Output of applying batch flatten operation on input
+    """
+    return topi.nn.flatten(inp)
+
+
+def batch_flatten_stir_schedule(
+    out: te.Tensor,
+    inp: te.Tensor,
+    out_layout: str,
+    in_layout: str,
+) -> tir.Schedule:
+    """STIR schedule definition for the compute of batch flatten compute.
+    Parameters
+    ----------
+    outputs : te.Tensor
+        The output tensor as returned by a call to batch_flatten_compute
+    input : te.Tensor
+        Input tensor to batch_flatten
+    out_layout: typing.Callable
+        The transformation function definition for the expected output layout
+    in_layout: typing.Callable
+        The transformation function definition for the input layout
+    Returns
+    -------
+    sch : tvm.tir.Schedule
+        The STIR schedule for slice batch flatten compute
+    """
+
+    batch_flatten_func = te.create_prim_func([inp, out])
+    sch = tir.Schedule(batch_flatten_func, debug_mask="all")
+    compute = sch.get_block("compute")
+
+    sch.transform_layout(compute, inp.name, get_layout_transform_fn(in_layout))
+    sch.transform_layout(compute, out.name, get_layout_transform_fn(out_layout))
+    i, j = sch.get_loops(compute)
+    jout, channel = sch.split(j, [None, inp.shape[3]])
+    height, width = sch.split(jout, [inp.shape[1], inp.shape[2]])
+    channelo, channeli = sch.split(channel, [None, 1024])
+    channelio, channelii = sch.split(channeli, [None, 64])
+    sch.reorder(i, height, width, channelo, channelio, channelii)
+    sch.vectorize(channelii)
+    return sch

python/tvm/topi/hexagon/utils.py

@@ -67,6 +67,16 @@ def nc_512c_2d(n, c):
     return [n, c // 512, te.AXIS_SEPARATOR, c % 512]
 
 
+def nhwc_1024c_2d(n, h, w, c):
+    """Return index map for nhwc_1024 2d layout"""
+    return [n, h, w, c // 1024, te.AXIS_SEPARATOR, c % 1024]
+
+
+def nc_1024_2d(n, c):
+    """Return index map for nc_1024 2d layout"""
+    return [n, c // 1024, te.AXIS_SEPARATOR, c % 1024]
+
+
 def get_layout_transform_fn(layout):
     """Return index map function as per the layout string"""
     if layout == "nhwc-8h2w32c2w-2d":
@@ -77,6 +87,10 @@ def get_layout_transform_fn(layout):
         return n11c_1024c_2d
     if layout == "n11c-1024c-1d":
         return n11c_1024c_1d
+    if layout == "nhwc-1024c-2d":
+        return nhwc_1024c_2d
+    if layout == "nc-1024-2d":
+        return nc_1024_2d
     if layout == "nhw-32h16w-2d":
         return nhw_32h16w_2d
     if layout == "nhwc-4h4w32c-2d":

tests/python/contrib/test_hexagon/infrastructure.py

@@ -245,6 +245,12 @@ def transform_numpy(arr_np, current_layout: str, new_layout: str):
             n, h, w, c = arr_np.shape
             assert h == 1 and w == 1, "The size of h and w must be 1"
             return arr_np.reshape([n, 1, 1, c // 1024, 1024])
+        if new_layout == "nc-1024-2d":
+            N, C = arr_np.shape
+            return arr_np.reshape([N, C // 1024, 1024])
+        if new_layout == "nhwc-1024c-2d":
+            N, H, W, C = arr_np.shape
+            return arr_np.reshape([N, H, W, C // 1024, 1024])
 
         raise RuntimeError(f"Unexpected new_layout '{new_layout}'")
 

tests/python/contrib/test_hexagon/topi/test_batch_flatten.py

@@ -0,0 +1,101 @@
+# 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 numpy as np
+import pytest
+
+import tvm
+import tvm.testing
+import tvm.topi.hexagon.slice_ops as sl
+from tvm import te, topi
+from tvm.contrib.hexagon.build import HexagonLauncher
+from tvm.topi import testing
+
+from ..infrastructure import allocate_hexagon_array, transform_numpy
+
+
+class BaseTestBatchFlatten:
+    input_shape = tvm.testing.parameter(
+        (1, 1, 1, 2048),
+        (1, 2, 4, 2048),
+        (1, 8, 8, 1024),
+        (2, 4, 8, 1024),
+        (2, 3, 5, 2048),
+    )
+    input_layout, input_axis_sep = tvm.testing.parameters(("nhwc-1024c-2d", [4]))
+    output_layout, output_axis_sep = tvm.testing.parameters(("nc-1024-2d", [2]))
+    data_type = tvm.testing.parameter("float16")
+
+
+class TestBatchFlatten(BaseTestBatchFlatten):
+    @tvm.testing.fixture
+    def output_shape(self, input_shape):
+        return input_shape[0], input_shape[1] * input_shape[2] * input_shape[3]
+
+    @tvm.testing.requires_hexagon
+    def test_batch_flatten(
+        self,
+        data_type,
+        input_shape,
+        input_layout,
+        input_axis_sep,
+        output_shape,
+        output_layout,
+        output_axis_sep,
+        hexagon_session,
+    ):
+        target_hexagon = tvm.target.hexagon("v69")
+        target = tvm.target.Target(target_hexagon, host=target_hexagon)
+        A = te.placeholder(input_shape, name="A", dtype=data_type)
+        D = sl.batch_flatten_compute(A)
+        tir_s = sl.batch_flatten_stir_schedule(
+            D,
+            A,
+            output_layout,
+            input_layout,
+        )
+        func_name = "batch_flatten"
+        with tvm.transform.PassContext(opt_level=3):
+            runtime_module = tvm.build(tir_s.mod, target=target, name=func_name)
+
+        mod = hexagon_session.load_module(runtime_module)
+
+        a_numpy = (np.random.uniform(-1, 1, input_shape)).astype(data_type)
+        ref = np.reshape(a_numpy, output_shape)
+
+        input_np_transformed = transform_numpy(a_numpy, "nhwc", input_layout)
+        ref_np_transformed = transform_numpy(ref, "nhwc", output_layout)
+
+        a_tvm = allocate_hexagon_array(
+            hexagon_session.device,
+            data=input_np_transformed,
+            axis_separators=input_axis_sep,
+            mem_scope="global.vtcm",
+        )
+        output = allocate_hexagon_array(
+            hexagon_session.device,
+            ref_np_transformed.shape,
+            data_type,
+            axis_separators=output_axis_sep,
+            mem_scope="global.vtcm",
+        )
+        mod(a_tvm, output)
+        np.testing.assert_allclose(output.numpy(), ref_np_transformed, atol=1e-07, rtol=0)
+
+
+if __name__ == "__main__":
+    tvm.testing.main(pytest.main(sys.argv))