[Topi] [Hexagon] Conv2d slice op initial version

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

@@ -20,3 +20,4 @@
 from .avg_pool2d import avg_pool2d_compute, avg_pool2d_STIR_schedule
 from .add_subtract_multiply import *
 from .softmax_slice import *
+from .conv2d import *

python/tvm/topi/hexagon/slice_ops/conv2d.py

@@ -0,0 +1,242 @@
+# 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.
+# pylint: disable=line-too-long
+
+"""Hexagon slice conv2d compute and schedule"""
+import typing
+
+import tvm
+from tvm import te
+
+from ..utils import get_layout_transform_fn
+
+
+def conv2d_compute(
+    activations: te.Tensor,
+    weights: te.Tensor,
+    out_shape: typing.Tuple,
+    stride: typing.Tuple,
+    dilation: typing.Tuple,
+    dtype: str,
+    output_name: str,
+    weights_width_reversed: bool = True,
+) -> te.Tensor:
+    """Compute for slice conv2d op for hexagon.
+
+    This op makes the following assumptions:
+    1. This op is written for a sliced convolution with 2d physical buffers
+    2. The input activations is assumed to be in NHWC layout and filter is in HWIO layout
+    3. Grouped convolutions are not supported. and there will be a separate compute definition for depthwise convolution
+    4. In order to get grouped convolutions, it is assumed that the op will be sliced according to the groups and multiple calls to this compute would be placed.
+
+
+    Parameters
+    ----------
+    activations : te.Tensor
+        Input activations padded for inner dimension size
+    weights : te.Tensor
+        Weights without dilation
+    out_shape : typing.Tuple
+        The logical output shape without considering input padding
+    stride : typing.Tuple
+        stride
+    dilation : typing.Tuple
+        dilation
+    dtype : str
+        dtype
+    output_name : str
+        The name to be given to output. This would become the block name for the corresponding STIR compute
+    weights_width_reversed : bool
+        The width axis of weights are expected in reverse order if weights_width_reversed is True
+
+    Returns
+    -------
+    output : te.Tensor
+        Output of applying 2D convolution of Weights on Input
+    """
+
+    filt_shape = weights.shape
+
+    reduce_channel = tvm.te.reduce_axis((0, filt_shape[2]), name="reduce_channel")
+    reduce_height = tvm.te.reduce_axis((0, filt_shape[0]), name="reduce_height")
+    reduce_width = tvm.te.reduce_axis((0, filt_shape[1]), name="reduce_width")
+    stride_height, stride_width = stride
+    dilation_height, dilation_width = dilation
+
+    if weights_width_reversed:
+        weights_width_var = filt_shape[1] - reduce_width - 1
+    else:
+        weights_width_var = reduce_width
+
+    output = tvm.te.compute(
+        out_shape,
+        lambda n, h, w, c: tvm.te.sum(
+            (
+                activations[
+                    n,
+                    h * stride_height + reduce_height * dilation_height,
+                    w * stride_width + reduce_width * dilation_width,
+                    reduce_channel,
+                ]
+                * weights[reduce_height, weights_width_var, reduce_channel, c]
+            ).astype(dtype),
+            axis=[reduce_channel, reduce_height, reduce_width],
+        ),
+        name=output_name,
+    )
+    return output
+
+
+def conv2d_te_schedule(
+    out: te.Tensor,
+    ins: typing.List[te.Tensor],
+    transform_activation_layout: str,
+    transform_weights_layout: str,
+    transform_output_layout: str,
+) -> te.Schedule:
+    """TE Schedule for the sliced conv2d op
+
+    This schedule makes the following assumptions:
+    1. There is only one output tensor
+    2. The activations and weights have specific layouts defined by the last 2 arguments
+    3. All transformation functions are expected to be a bijection for now
+
+    Parameters
+    ----------
+    out : te.Tensor
+        The output tensor returned by a call to conv2d_compute
+    ins : typing.List[te.Tensor]
+        The list of 2 Tensors which would be the input activations and weights
+    transform_activation_layout : str
+        The expected activations layout
+    transform_weights_layout : str
+        String representing the weights layout as defined in get_layout_transform_fn
+    transform_output_layout: str
+        String representing the output layout as defined in get_layout_transform_fn
+
+    Returns
+    -------
+    sch : te.Schedule
+        The TE schedule for slice conv2d
+    """
+    activations, weights = ins
+    output = out
+    sch = tvm.te.create_schedule(output.op)
+    reduce_channel, reduce_height, reduce_width = sch[output].op.reduce_axis
+    sch[activations].transform_layout(get_layout_transform_fn(transform_activation_layout))
+    sch[weights].transform_layout(get_layout_transform_fn(transform_weights_layout))
+    transformed_axis = sch[output].transform_layout(
+        get_layout_transform_fn(transform_output_layout)
+    )
+    fused_out_axis = sch[output].fuse(transformed_axis[-1], transformed_axis[-2])
+    sch[output].reorder(
+        *[*transformed_axis[:-2], reduce_height, reduce_width, reduce_channel, fused_out_axis]
+    )
+    # The below code doesn't work yet as vectorization across 2D boundary is not yet supported
+    # s[output].vectorize(fused_out_axis)
+    return sch
+
+
+def conv2d_schedule(
+    outs: te.Tensor,
+    ins: typing.List[te.Tensor],
+    transform_activation_layout: str,
+    transform_weights_layout: str,
+    transform_output_layout: str,
+    output_name: str,
+) -> tvm.tir.Schedule:
+    """STIR schedule definition for the compute defined above by conv2d_compute.
+
+    - Auto-generated prim_func before applying schedule primitives for reference
+    - The below TVMScript code is for conv2d with padded input dimensions and a stride of 1x1
+
+    # from tvm.script import tir as T
+    @T.prim_func
+    def func(InputTensor: T.Buffer[(1, 24, 12, 32), "float16"], Weights: T.Buffer[(3, 3, 32, 32), "float16"], compute: T.Buffer[(1, 16, 8, 32), "float16"]) -> None:
+        # function attr dict
+        T.func_attr({"global_symbol": "main", "tir.noalias": True})
+        # body
+        # with T.block("root")
+        for i0, i1, i2, i3, i4, i5, i6 in T.grid(1, 16, 8, 32, 32, 3, 3):
+            with T.block("compute"):
+                n, h, w, c, rc, rh, rw = T.axis.remap("SSSSRRR", [i0, i1, i2, i3, i4, i5, i6])
+                T.reads(InputTensor[n, h + rh, w + rw, rc], Weights[rh, rw, rc, c])
+                T.writes(compute[n, h, w, c])
+                with T.init():
+                    compute[n, h, w, c] = T.float16(0)
+                compute[n, h, w, c] = compute[n, h, w, c] + InputTensor[n, h + rh, w + rw, rc] * Weights[rh, rw, rc, c]
+
+    Parameters
+    ----------
+    outs : te.Tensor
+        The output Tensor as returned by a call to conv2d_compute
+    ins : typing.List[te.Tensor]
+        This is a list of 2 tensors - Input activations and Weights
+    transform_activation_layout : str
+        String representing the activations layout as defined in get_layout_transform_fn
+    transform_weights_layout : str
+        String representing the weights layout as defined in get_layout_transform_fn
+    transform_output_layout: str
+        String representing the output layout as defined in get_layout_transform_fn
+    output_name : str
+        The name that was given to the output compute and which can be used to get the block name
+
+    Returns
+    -------
+    sch : tvm.tir.Schedule
+        The STIR schedule for slice conv2d compute
+    """
+
+    assert len(ins) == 2, "This schedule expects only 2 inputs - Activations and Weights"
+    source_expr = ins + [outs]
+    prim_func = tvm.te.create_prim_func(source_expr)
+    sch = tvm.tir.Schedule(prim_func)
+
+    compute = sch.get_block(output_name)
+    # Apply layout_transform for activation
+    sch.transform_layout(compute, ins[0].name, get_layout_transform_fn(transform_activation_layout))
+
+    # Apply layout_transform for weights
+    sch.transform_layout(compute, ins[1].name, get_layout_transform_fn(transform_weights_layout))
+
+    # Apply layout_transform for output
+    sch.transform_layout(compute, outs.name, get_layout_transform_fn(transform_output_layout))
+
+    batch, height, width, channel, reduce_channel, reduce_height, reduce_width = sch.get_loops(
+        compute
+    )  # This still returns the original 7d loop
+    h_outer, h_inner = sch.split(height, [None, 8])
+    w_outer, w_inner = sch.split(width, [None, 4])
+    w_inner_outer, w_inner_inner = sch.split(w_inner, [2, 2])
+    c_outer, c_inner = sch.split(channel, [None, 32])
+    sch.reorder(
+        batch,
+        h_outer,
+        w_outer,
+        c_outer,
+        h_inner,
+        w_inner_outer,
+        reduce_height,
+        reduce_width,
+        reduce_channel,
+        c_inner,
+        w_inner_inner,
+    )
+    sch.decompose_reduction(compute, reduce_height)
+    # ci_wii = s.fuse(ci, wii)
+    # s.vectorize(ci_wii)
+    return sch

python/tvm/topi/hexagon/utils.py

@@ -62,6 +62,18 @@ def nc_512c_2d(n, c):
     return [n, c // 512, te.AXIS_SEPARATOR, c % 512]
 
 
+def iohw_16i32o2i_1d(height, width, in_channel, out_channel):
+    return [
+        in_channel // 32,
+        out_channel // 32,
+        height,
+        width,
+        (in_channel % 32) // 2,
+        out_channel % 32,
+        in_channel % 2,
+    ]
+
+
 def get_layout_transform_fn(layout):
     """Return index map function as per the layout string"""
     if layout == "nhwc-8h2w32c2w-2d":
@@ -80,4 +92,6 @@ def get_layout_transform_fn(layout):
         return nc_512c_2d
     if layout == "nc-512c-1d":
         return nc_512c_1d
+    if layout == "iohw-16i32o2i-1d":
+        return iohw_16i32o2i_1d
     raise RuntimeError(f"Unexpected layout '{layout}'")