Refactoring x86 conv2d_NCHWc (#3944)

python/tvm/relay/op/nn/_nn.py

@@ -548,6 +548,34 @@ reg.register_pattern("nn.contrib_conv2d_NCHWc",
                      OpPattern.OUT_ELEMWISE_FUSABLE)
 
 
+@reg.register_compute("nn.contrib_conv2d_NCHWc_int8")
+def compute_contrib_conv2d_NCHWc_int8(attrs, inputs, out_dtype, target):
+    """Compute definition of conv2d NCHWc"""
+    # pylint: disable=assignment-from-no-return
+    padding = attrs.get_int_tuple("padding")
+    strides = attrs.get_int_tuple("strides")
+    dilation = attrs.get_int_tuple("dilation")
+    data_layout = attrs.get_str("data_layout")
+    out_layout = attrs.get_str("out_layout")
+    out_dtype = attrs.get_str("out_dtype")
+    out_dtype = inputs[0].dtype if out_dtype == "" else out_dtype
+
+    out = topi.nn.conv2d_NCHWc_int8(inputs[0], inputs[1], strides, padding, dilation,
+                                    data_layout, out_layout, out_dtype)
+    return [out]
+
+
+@reg.register_schedule("nn.contrib_conv2d_NCHWc_int8")
+def schedule_contrib_conv2d_NCHWc_int8(attrs, outs, target):
+    """Schedule definition of contrib_conv2d_NCHWc_int8"""
+    with target:
+        return topi.generic.schedule_conv2d_NCHWc_int8(outs)
+
+
+reg.register_pattern("nn.contrib_conv2d_NCHWc_int8",
+                     OpPattern.OUT_ELEMWISE_FUSABLE)
+
+
 @reg.register_compute("nn.contrib_depthwise_conv2d_NCHWc")
 def compute_contrib_depthwise_conv2d_NCHWc(attrs, inputs, out_dtype, target):
     """Compute definition of depthwise conv2d NCHWc"""

python/tvm/relay/op/nn/nn.py

@@ -1340,6 +1340,72 @@ def contrib_depthwise_conv2d_nchwc(data,
                                                 groups, channels, kernel_size, data_layout,
                                                 kernel_layout, out_layout, out_dtype)
 
+def contrib_conv2d_nchwc_int8(data,
+                              kernel,
+                              strides=(1, 1),
+                              padding=(0, 0),
+                              dilation=(1, 1),
+                              groups=1,
+                              channels=None,
+                              kernel_size=None,
+                              data_layout="NCHW8c",
+                              kernel_layout="OIHW",
+                              out_layout="",
+                              out_dtype=""):
+    r"""Variant of 2D convolution. It deals with only int8 inputs.
+
+    This operator takes the weight as the convolution kernel
+    and convolves it with data to produce an output, following a specialized
+    NCHWc data layout.
+
+    Parameters
+    ----------
+    data : tvm.relay.Expr
+        The input data to the operator.
+
+    kernel : tvm.relay.Expr
+        The kernel expressions.
+
+    strides : tuple of int, optional
+        The strides of convolution.
+
+    padding : tuple of int, optional
+        The padding of convolution on both sides of inputs before convolution.
+
+    dilation : tuple of int, optional
+        Specifies the dilation rate to be used for dilated convolution.
+
+    groups : int, optional
+        Number of groups for grouped convolution.
+
+    channels : int, optional
+        Number of output channels of this convolution.
+
+    kernel_size : tuple of int, optional
+        The spatial of the convolution kernel.
+
+    data_layout : str, optional
+        Layout of the input.
+
+    kernel_layout : str, optional
+        Layout of the weight.
+
+    out_layout : str, optional
+        Layout of the output, by default, out_layout is the same as data_layout
+
+    out_dtype : str, optional
+        Specifies the output data type for mixed precision conv2d.
+
+    Returns
+    -------
+    result : tvm.relay.Expr
+        The computed result.
+    """
+    return _make.contrib_conv2d_NCHWc_int8(data, kernel, strides, padding, dilation,
+                                           groups, channels, kernel_size, data_layout,
+                                           kernel_layout, out_layout, out_dtype)
+
+
 def contrib_conv2d_winograd_weight_transform(weight,
                                              tile_size):
     r"""Weight Transformation part for 2D convolution with winograd algorithm.

src/relay/op/nn/convolution.cc

@@ -570,6 +570,54 @@ weight transformation in advance.
 .set_support_level(10)
 .add_type_rel("Conv2DWinogradNNPACKWeightTransform", Conv2DWinogradNNPACKWeightTransformRel);
 
+// Positional relay function to create conv2d NCHWc operator
+// used by frontend FFI.
+Expr MakeConv2DNCHWcInt8(Expr data,
+                         Expr kernel,
+                         Array<IndexExpr> strides,
+                         Array<IndexExpr> padding,
+                         Array<IndexExpr> dilation,
+                         int groups,
+                         IndexExpr channels,
+                         Array<IndexExpr> kernel_size,
+                         std::string data_layout,
+                         std::string kernel_layout,
+                         std::string out_layout,
+                         DataType out_dtype) {
+  auto attrs = make_node<Conv2DAttrs>();
+  attrs->strides = std::move(strides);
+  attrs->padding = std::move(padding);
+  attrs->dilation = std::move(dilation);
+  attrs->groups = groups;
+  attrs->channels = channels;
+  attrs->kernel_size = std::move(kernel_size);
+  attrs->data_layout = std::move(data_layout);
+  attrs->kernel_layout = std::move(kernel_layout);
+  attrs->out_layout = std::move(out_layout);
+  attrs->out_dtype = std::move(out_dtype);
+  static const Op& op = Op::Get("nn.contrib_conv2d_NCHWc_int8");
+  return CallNode::make(op, {data, kernel}, Attrs(attrs), {});
+}
+
+TVM_REGISTER_API("relay.op.nn._make.contrib_conv2d_NCHWc_int8")
+.set_body_typed(MakeConv2DNCHWcInt8);
+
+
+RELAY_REGISTER_OP("nn.contrib_conv2d_NCHWc_int8")
+.describe(R"code(Compute conv2d with NCHWc data layout with int8 inputs.
+- **data**: Input is 5D packed tensor.
+- **weight**: 7D packed tensor.
+
+- **out**:  Output is 5D packed tensor
+)code" TVM_ADD_FILELINE)
+.set_attrs_type_key("relay.attrs.Conv2D")
+.set_num_inputs(2)
+.add_argument("data", "Tensor", "The input tensor.")
+.add_argument("weight", "Tensor", "The weight tensor.")
+.set_support_level(10)
+.add_type_rel("Conv2DNCHWcInt8", Conv2DWinogradRel<Conv2DAttrs>)
+.set_attr<FInferCorrectLayout>("FInferCorrectLayout",
+        Conv2DInferCorrectLayout<Conv2DAttrs>);
 
 // Positional relay function to create conv2d NCHWc operator
 // used by frontend FFI.

topi/python/topi/generic/nn.py

@@ -108,6 +108,25 @@ def schedule_conv2d_NCHWc(outs):
 
 
 @tvm.target.generic_func
+def schedule_conv2d_NCHWc_int8(outs):
+    """Schedule for conv2d_NCHW[x]c_int8
+
+    Parameters
+    ----------
+    outs : Array of Tensor
+        The computation graph description of conv2d_NCHWc_int8
+        in the format of an array of tensors.
+        The number of filter, i.e., the output channel.
+
+    Returns
+    -------
+    sch : Schedule
+        The computation schedule for the op.
+    """
+    return _default_schedule(outs, False)
+
+
+@tvm.target.generic_func
 def schedule_conv2d_winograd_weight_transform(outs):
     """Schedule for weight transformation of winograd
 

topi/python/topi/nn/conv2d.py

@@ -398,27 +398,75 @@ def conv2d_NCHWc(data, kernel, stride, padding, dilation, layout, out_layout, ou
     output : tvm.Tensor
         5-D with shape [batch, out_channel_chunk, out_height, out_width, out_channel_block]
     """
-    # search platform specific declaration first
-    # default declaration
+
+    return conv2d_NCHWc_compute(data,
+                                kernel,
+                                stride,
+                                padding,
+                                dilation,
+                                layout,
+                                out_layout,
+                                out_dtype)
+
+
+def conv2d_NCHWc_compute(data, kernel, strides, padding, dilation, layout, out_layout, out_dtype):
+    """Conv2D operator compute for nChw[x]c layout.
+
+    Parameters
+    ----------
+    data : tvm.Tensor
+        5-D with shape [batch, in_channel_chunk, in_height, in_width, in_channel_block]
+
+    kernel : tvm.Tensor
+        6-D with shape
+        [num_filter_chunk, in_channel_chunk, filter_height, filter_width,
+        in_channel_block, num_filter_block]
+
+    stride : int or a list/tuple of two ints
+        stride size, or [stride_height, stride_width]
+
+    padding : int or a list/tuple of two ints
+        padding size, or [pad_height, pad_width]
+
+    dilation: int or a list/tuple of two ints
+        dilation size, or [dilation_height, dilation_width]
+
+    layout : str
+        Input data layout
+
+    out_layout : str
+        Output data layout
+
+    out_dtype : str
+        output data type
+
+    Returns
+    -------
+    output : tvm.Tensor
+        5-D with shape [batch, out_channel_chunk, out_height, out_width, out_channel_block]
+    """
+
     # layout and out_layout are not used here,
     # we keep them for debug convenience when dumping autotvm workload
-    pad_top, pad_left, pad_down, pad_right = get_pad_tuple(padding,
-                                                           (dilated_kernel_h,
-                                                            dilated_kernel_w))
-    HPAD = pad_top + pad_down
-    WPAD = pad_left + pad_right
-    HSTR, WSTR = stride if isinstance(stride, (tuple, list)) else (stride, stride)
-    dh, dw = dilation if isinstance(dilation, (tuple, list)) else (dilation, dilation)
-    assert (dh, dw) == (1, 1), "Does not support dilation"
+    HPAD, WPAD = padding if isinstance(padding, (tuple, list)) else (padding, padding)
+    HSTR, WSTR = strides if isinstance(strides, (tuple, list)) else (strides, strides)
+    dilation_h, dilation_w = dilation if isinstance(dilation, (tuple, list)) \
+        else (dilation, dilation)
 
     n, ic_chunk, ih, iw, ic_bn = get_const_tuple(data.shape)
     in_channel = ic_chunk * ic_bn
-    oc_chunk, _, kernel_height, kernel_width, _, oc_bn = get_const_tuple(kernel.shape)
+    target = tvm.target.current_target(allow_none=False)
+    oc_chunk, ic_chunk_group, kernel_height, kernel_width, _, oc_bn = \
+        get_const_tuple(kernel.shape)
     num_filter = oc_chunk * oc_bn
+    groups = ic_chunk // ic_chunk_group
+
+    dilated_kernel_h = (kernel_height - 1) * dilation_h + 1
+    dilated_kernel_w = (kernel_width - 1) * dilation_w + 1
 
     # output shape
-    out_height = (ih + 2 * HPAD - kernel_height) // HSTR + 1
-    out_width = (iw + 2 * WPAD - kernel_width) // WSTR + 1
+    out_height = (ih + 2 * HPAD - dilated_kernel_h) // HSTR + 1
+    out_width = (iw + 2 * WPAD - dilated_kernel_w) // WSTR + 1
     oshape = (n, oc_chunk, out_height, out_width, oc_bn)
 
     # DOPAD
@@ -433,13 +481,194 @@ def conv2d_NCHWc(data, kernel, stride, padding, dilation, layout, out_layout, ou
     kw = tvm.reduce_axis((0, kernel_width), name='kw')
 
     return tvm.compute(oshape, lambda n, oc_chunk, oh, ow, oc_block:
-                       tvm.sum(data_pad[n, ic//ic_bn, oh*HSTR+kh, ow*WSTR+kw,
-                                        ic%ic_bn].astype(out_dtype) *
-                               kernel[oc_chunk, ic//ic_bn, kh, kw, ic%ic_bn, oc_block],
+                       tvm.sum(data_pad[n,
+                                        ic // ic_bn,
+                                        oh * HSTR + kh * dilation_h,
+                                        ow * WSTR + kw * dilation_w,
+                                        ic % ic_bn].astype(out_dtype)
+                               * kernel[oc_chunk,
+                                        ic // ic_bn,
+                                        kh,
+                                        kw,
+                                        ic % ic_bn,
+                                        oc_block],
                                axis=[ic, kh, kw]),
                        name='conv2d_NCHWc', tag="conv2d_NCHWc")
 
 
+@tvm.target.generic_func
+def conv2d_NCHWc_int8(data, kernel, strides, padding, dilation, layout, out_layout,
+                      out_dtype='int32'):
+    """Conv2D operator for nChw[x]c layout.
+
+    Parameters
+    ----------
+    data : tvm.Tensor
+        5-D with shape [batch, in_channel_chunk, in_height, in_width, in_channel_block]
+
+    kernel : tvm.Tensor
+        7-D with shape
+        [num_filter_chunk, in_channel_chunk, filter_height, filter_width, in_channel_block/4,
+        num_filter_block, 4]
+
+    stride : int or a list/tuple of two ints
+        stride size, or [stride_height, stride_width]
+
+    padding : int or a list/tuple of two ints
+        padding size, or [pad_height, pad_width]
+
+    dilation: int or a list/tuple of two ints
+        dilation size, or [dilation_height, dilation_width]
+
+    layout : str
+        Input data layout
+
+    out_layout : str
+        Output data layout
+
+    out_dtype : str
+        output data type
+
+    Returns
+    -------
+    output : tvm.Tensor
+        5-D with shape [batch, out_channel_chunk, out_height, out_width, out_channel_block]
+    """
+
+    return conv2d_NCHWc_int8_compute(data,
+                                     kernel,
+                                     strides,
+                                     padding,
+                                     dilation,
+                                     layout,
+                                     out_layout,
+                                     out_dtype)
+
+
+def conv2d_NCHWc_int8_compute(data, kernel, strides, padding, dilation, layout, out_layout,
+                              out_dtype='int32'):
+    """Conv2D operator for nChw[x]c layout.
+
+    Parameters
+    ----------
+    data : tvm.Tensor
+        5-D with shape [batch, in_channel_chunk, in_height, in_width, in_channel_block]
+
+    kernel : tvm.Tensor
+        7-D with shape
+        [num_filter_chunk, in_channel_chunk, filter_height, filter_width, in_channel_block/4,
+        num_filter_block, 4]
+
+    stride : int or a list/tuple of two ints
+        stride size, or [stride_height, stride_width]
+
+    padding : int or a list/tuple of two ints
+        padding size, or [pad_height, pad_width]
+
+    dilation: int or a list/tuple of two ints
+        dilation size, or [dilation_height, dilation_width]
+
+    layout : str
+        Input data layout
+
+    out_layout : str
+        Output data layout
+
+    out_dtype : str
+        output data type
+
+    Returns
+    -------
+    output : tvm.Tensor
+        5-D with shape [batch, out_channel_chunk, out_height, out_width, out_channel_block]
+    """
+
+    # layout and out_layout are not used here,
+    # we keep them for debug convenience when dumping autotvm workload
+    HPAD, WPAD = padding if isinstance(padding, (tuple, list)) else (padding, padding)
+    HSTR, WSTR = strides if isinstance(strides, (tuple, list)) else (strides, strides)
+    dilation_h, dilation_w = dilation if isinstance(dilation, (tuple, list)) \
+        else (dilation, dilation)
+
+    n, ic_chunk, ih, iw, ic_bn = get_const_tuple(data.shape)
+    in_channel = ic_chunk * ic_bn
+    target = tvm.target.current_target(allow_none=False)
+    oc_chunk, ic_chunk_group, kernel_height, kernel_width, _, oc_bn, _ = \
+        get_const_tuple(kernel.shape)
+    num_filter = oc_chunk * oc_bn
+    groups = ic_chunk // ic_chunk_group
+
+    # Since the weight is 7-D and the last element size is 4, we have to
+    # check ic_bn should be a multiple of 4.
+    # Similary, oc_bn has to be a multiple of 4.
+
+    assert ic_bn % 4 == 0
+    assert oc_bn % 16 == 0
+
+    dilated_kernel_h = (kernel_height - 1) * dilation_h + 1
+    dilated_kernel_w = (kernel_width - 1) * dilation_w + 1
+
+    # output shape
+    out_height = (ih + 2 * HPAD - dilated_kernel_h) // HSTR + 1
+    out_width = (iw + 2 * WPAD - dilated_kernel_w) // WSTR + 1
+    oshape = (n, oc_chunk, out_height, out_width, oc_bn)
+
+    # DOPAD
+    DOPAD = (HPAD != 0 or WPAD != 0)
+    if DOPAD:
+        data_pad = pad(data, (0, 0, HPAD, WPAD, 0), name="data_pad")
+    else:
+        data_pad = data
+
+    ic = tvm.reduce_axis((0, in_channel), name='ic')
+    kh = tvm.reduce_axis((0, kernel_height), name='kh')
+    kw = tvm.reduce_axis((0, kernel_width), name='kw')
+
+    if groups == 1:
+        n_elems = 4
+        ic_outer = tvm.reduce_axis((0, in_channel//ic_bn), name='ic_outer')
+        ic_f_inner = tvm.reduce_axis((0, ic_bn//n_elems), name='ic_f_inner')
+        ic_s_inner = tvm.reduce_axis((0, n_elems), name='ic_s_inner')
+        return tvm.compute(oshape, lambda n, oc_chunk, oh, ow, oc_block:
+                           tvm.sum(data_pad[n,
+                                            ic_outer,
+                                            oh * HSTR + kh * dilation_h,
+                                            ow * WSTR + kw * dilation_w,
+                                            ic_f_inner * n_elems + ic_s_inner].astype(out_dtype)
+                                   * kernel[oc_chunk,
+                                            ic_outer,
+                                            kh,
+                                            kw,
+                                            ic_f_inner,
+                                            oc_block,
+                                            ic_s_inner].astype(out_dtype),
+                                   axis=[kh, kw, ic_outer, ic_f_inner, ic_s_inner]),
+                           name='conv2d_NCHWc_int8', tag="conv2d_NCHWc_int8")
+    # for int8 group conv support
+    n_elems = 4
+    ic_chunk = in_channel//ic_bn
+    ic_outer = tvm.reduce_axis((0, ic_chunk//groups), name='ic_outer')
+    ic_f_inner = tvm.reduce_axis((0, ic_bn//n_elems), name='ic_f_inner')
+    ic_s_inner = tvm.reduce_axis((0, n_elems), name='ic_s_inner')
+    oshape = (n, oc_chunk, out_height, out_width, oc_bn)
+    return tvm.compute(oshape, lambda n, occ, oh, ow, oc_block:
+                       tvm.sum(data_pad[n,
+                                        (occ * oc_bn // (oc_chunk * oc_bn // groups))
+                                        * (ic_chunk // groups) + ic_outer,
+                                        oh * HSTR + kh,
+                                        ow * WSTR + kw,
+                                        ic_f_inner * n_elems +  ic_s_inner].astype(out_dtype)
+                               * kernel[occ,
+                                        ic_outer,
+                                        kh,
+                                        kw,
+                                        ic_f_inner,
+                                        oc_block,
+                                        ic_s_inner].astype(out_dtype),
+                               axis=[kh, kw, ic_outer, ic_f_inner, ic_s_inner]),
+                       name='conv2d_NCHWc_int8', tag="conv2d_NCHWc_int8")
+
+
 
 def conv2d_winograd_weight_transform(kernel, tile_size):
     """Weight transformation for winograd

topi/python/topi/x86/__init__.py

@@ -6,6 +6,7 @@ from .conv2d import schedule_conv2d, schedule_conv2d_nhwc
 from .binarize_pack import schedule_binarize_pack
 from .binary_dense import schedule_binary_dense
 from .nn import *
+from .conv2d_int8 import *
 from .injective import *
 from .pooling import schedule_pool, schedule_adaptive_pool
 from .bitserial_conv2d import schedule_bitserial_conv2d

topi/python/topi/x86/conv2d.py

@@ -263,58 +263,6 @@ def schedule_conv2d(cfg, outs):
     traverse(outs[0].op)
     return s
 
-
-@autotvm.register_topi_schedule(generic.schedule_conv2d_nhwc_pack, 'cpu', ['direct'])
-def schedule_conv2d_nhwc_pack(cfg, outs):
-    """Create schedule for tensors"""
-    s = tvm.create_schedule([x.op for x in outs])
-    output_op = outs[0].op
-    scheduled_ops = []
-
-    def traverse(op):
-        """Traverse operators from computation graph"""
-        # inline all one-to-one-mapping operators except the last stage (output)
-        if tag.is_broadcast(op.tag):
-            if op not in s.outputs:
-                s[op].compute_inline()
-            else: # inject custom schedule
-                if len(op.axis) == 4: # schedule bias + bn + relu
-                    n, h, w, c = op.axis
-                    fused = s[op].fuse(n, h, w)
-                    s[op].parallel(fused)
-                    s[op].vectorize(c)
-            for tensor in op.input_tensors:
-                if isinstance(tensor.op, tvm.tensor.ComputeOp) and tensor.op not in scheduled_ops:
-                    traverse(tensor.op)
-
-        if 'conv2d_nhwc_pack_int8' in op.tag:
-            conv_out = op.output(0)
-            kernel = conv_out.op.input_tensors[1]
-            data_vec = conv_out.op.input_tensors[0]
-            data = data_vec.op.input_tensors[0] \
-                if isinstance(data_vec.op, tvm.tensor.ComputeOp) and "pad" not in data_vec.op.tag \
-                else data_vec
-            if isinstance(data.op, tvm.tensor.ComputeOp) and "pad" in data.op.tag:
-                data_pad = data
-                data = data_pad.op.input_tensors[0]
-
-            args = [s, cfg, data_vec, conv_out, outs[0]]
-            if data.dtype == 'uint8':
-                kh, kw, _, _, _ = get_const_tuple(kernel.shape)
-                if kh == 1 and kw == 1:
-                    conv2d_avx_1x1._schedule_conv_nhwc_pack_int8(*args)
-                else:
-                    raise ValueError("Only support 1x1 kernel with "
-                                     "schedule_conv2d_nhwc_pack.")
-            else:
-                raise ValueError("Not support this data type {} with "
-                                 "schedule_conv2d_nhwc_pack. Only support int8".format(data.dtype))
-
-        scheduled_ops.append(op)
-    traverse(output_op)
-    return s
-
-
 @generic.schedule_conv2d_nhwc.register("cpu")
 def schedule_conv2d_nhwc(outs):
     """Create schedule for tensors"""
@@ -477,7 +425,11 @@ def _alter_conv2d_layout(attrs, inputs, tinfo, F):
             [new_data, new_kernel, strides, padding, dilation, new_attrs[layout_name],
              new_attrs['out_layout'], out_dtype], depthwise_conv2d_NCHWc)
         dispatch_ctx.update(target, new_workload, cfg)
-    else:
+        if F.__name__ == 'nnvm.symbol':
+            logging.warning("Use native layout for depthwise convolution on NNVM.")
+            return None
+        return F.nn.contrib_depthwise_conv2d_nchwc(*copy_inputs, **new_attrs)
+
     if _is_int8_hw_support(data.dtype, kernel.dtype, target):
         # Convert kernel data layout from 4D to 7D
         n_elems = 4
@@ -501,7 +453,11 @@ def _alter_conv2d_layout(attrs, inputs, tinfo, F):
              new_attrs[layout_name], new_attrs['out_layout'], out_dtype],
             conv2d_NCHWc)
         dispatch_ctx.update(target, new_workload, cfg)
-        else:
+        if F.__name__ == 'nnvm.symbol':
+            logging.warning("Use native layout for int8 convolution on NNVM.")
+            return None
+        return F.nn.contrib_conv2d_nchwc_int8(*copy_inputs, **new_attrs)
+
     out_channel, _, kh, kw = get_const_tuple(kernel.shape)
     # (oc, ic, h, w) -> (OC, IC, h, w, ic, oc)
     new_attrs['kernel_layout'] = 'OIHW%di%do' % (ic_bn, oc_bn)
@@ -513,12 +469,6 @@ def _alter_conv2d_layout(attrs, inputs, tinfo, F):
          new_attrs['out_layout'], out_dtype], conv2d_NCHWc)
     dispatch_ctx.update(target, new_workload, cfg)
 
-    if is_depthwise:
-        if F.__name__ == 'nnvm.symbol':
-            logging.warning("Use native layout for depthwise convolution on NNVM.")
-            return None
-        return F.nn.contrib_depthwise_conv2d_nchwc(*copy_inputs, **new_attrs)
-    else:
     if F.__name__ == 'nnvm.symbol':
         return F.contrib.conv2d_NCHWc(*copy_inputs, **new_attrs)
     return F.nn.contrib_conv2d_nchwc(*copy_inputs, **new_attrs)
@@ -544,95 +494,27 @@ def _declaration_conv_NCHWc(cfg, data, kernel, strides,
                             padding, dilation, layout, out_layout, out_dtype):
     # layout and out_layout are not used here,
     # we keep them for debug convenience when dumping autotvm workload
-    HPAD, WPAD = padding if isinstance(padding, (tuple, list)) else (padding, padding)
-    HSTR, WSTR = strides if isinstance(strides, (tuple, list)) else (strides, strides)
-    dilation_h, dilation_w = dilation if isinstance(dilation, (tuple, list)) \
-        else (dilation, dilation)
-
     n, ic_chunk, ih, iw, ic_bn = get_const_tuple(data.shape)
     in_channel = ic_chunk * ic_bn
-    target = tvm.target.current_target(allow_none=False)
-    if _is_int8_hw_support(data.dtype, kernel.dtype, target):
-        oc_chunk, ic_chunk_group, kernel_height, kernel_width, _, oc_bn, _ = \
-            get_const_tuple(kernel.shape)
-    else:
     oc_chunk, ic_chunk_group, kernel_height, kernel_width, _, oc_bn = \
             get_const_tuple(kernel.shape)
     num_filter = oc_chunk * oc_bn
-    groups = ic_chunk // ic_chunk_group
-
-    dilated_kernel_h = (kernel_height - 1) * dilation_h + 1
-    dilated_kernel_w = (kernel_width - 1) * dilation_w + 1
 
+    # If no config was set, we can fallback to NCHW config.
     if cfg.is_fallback:
         _get_default_config(cfg, tvm.placeholder((n, in_channel, ih, iw), dtype=data.dtype),
                             tvm.placeholder((num_filter, in_channel, kernel_height, kernel_width),
                                             dtype=kernel.dtype),
                             strides, padding, out_dtype)
 
-    # output shape
-    out_height = (ih + 2 * HPAD - dilated_kernel_h) // HSTR + 1
-    out_width = (iw + 2 * WPAD - dilated_kernel_w) // WSTR + 1
-    oshape = (n, oc_chunk, out_height, out_width, oc_bn)
-
-    # DOPAD
-    DOPAD = (HPAD != 0 or WPAD != 0)
-    if DOPAD:
-        data_pad = pad(data, (0, 0, HPAD, WPAD, 0), name="data_pad")
-    else:
-        data_pad = data
-
-    ic = tvm.reduce_axis((0, in_channel), name='ic')
-    kh = tvm.reduce_axis((0, kernel_height), name='kh')
-    kw = tvm.reduce_axis((0, kernel_width), name='kw')
-
-    if _is_int8_hw_support(data.dtype, kernel.dtype, target) and groups == 1:
-        assert out_dtype == "int32", \
-            "INT8 convolution requires input dtype = uint8 and output dtype=int32"
-        # Intel performs dot product of 2 "4" Int8 values
-        # Current implementation requires ic_bn to be a multiple of 4
-        n_elems = 4
-        assert ic_bn % n_elems == 0
-
-        ic_outer = tvm.reduce_axis((0, in_channel//ic_bn), name='ic_outer')
-        ic_f_inner = tvm.reduce_axis((0, ic_bn//n_elems), name='ic_f_inner')
-        ic_s_inner = tvm.reduce_axis((0, n_elems), name='ic_s_inner')
-        return tvm.compute(oshape, lambda n, oc_chunk, oh, ow, oc_block:
-                           tvm.sum(data_pad[n, ic_outer, oh*HSTR+kh*dilation_h,
-                                            ow*WSTR+kw*dilation_w,
-                                            ic_f_inner * n_elems + ic_s_inner]
-                                   .astype(out_dtype) *
-                                   kernel[oc_chunk, ic_outer, kh, kw, ic_f_inner,
-                                          oc_block, ic_s_inner].astype(out_dtype),
-                                   axis=[kh, kw, ic_outer, ic_f_inner, ic_s_inner]),
-                           name='conv2d_NCHWc_int8', tag="conv2d_NCHWc_int8")
-
-    if _is_int8_hw_support(data.dtype, kernel.dtype, target):
-    	# for int8 group conv support
-        n_elems = 4
-        ic_chunk = in_channel//ic_bn
-        ic_outer = tvm.reduce_axis((0, ic_chunk//groups), name='ic_outer')
-        ic_f_inner = tvm.reduce_axis((0, ic_bn//n_elems), name='ic_f_inner')
-        ic_s_inner = tvm.reduce_axis((0, n_elems), name='ic_s_inner')
-        oshape = (n, oc_chunk, out_height, out_width, oc_bn)
-        return tvm.compute(oshape, lambda n, occ, oh, ow, oc_block:
-                           tvm.sum(data_pad[n, (occ*oc_bn//(oc_chunk*oc_bn//groups))*\
-                                            (ic_chunk//groups)+ic_outer,
-                                            oh*HSTR+kh, ow*WSTR+kw,
-                                            ic_f_inner * n_elems +  ic_s_inner].astype(out_dtype) *
-                                   kernel[occ, ic_outer, kh, kw, ic_f_inner,
-                                          oc_block, ic_s_inner].astype(out_dtype),
-                                   axis=[kh, kw, ic_outer, ic_f_inner, ic_s_inner]),
-                           name='conv2d_NCHWc_int8', tag="conv2d_NCHWc_int8")
-
-    # else: fp implementation
-    return tvm.compute(oshape, lambda n, oc_chunk, oh, ow, oc_block:
-                       tvm.sum(data_pad[n, ic//ic_bn, oh*HSTR+kh*dilation_h,
-                                        ow*WSTR+kw*dilation_w,
-                                        ic%ic_bn].astype(out_dtype) *
-                               kernel[oc_chunk, ic//ic_bn, kh, kw, ic%ic_bn, oc_block],
-                               axis=[ic, kh, kw]),
-                       name='conv2d_NCHWc', tag="conv2d_NCHWc")
+    return nn.conv2d_NCHWc_compute(data,
+                                   kernel,
+                                   strides,
+                                   padding,
+                                   dilation,
+                                   layout,
+                                   out_layout,
+                                   out_dtype)
 
 
 @autotvm.register_topi_schedule(generic.schedule_conv2d_NCHWc, 'cpu', ['direct'])
@@ -664,14 +546,6 @@ def _schedule_conv2d_NCHWc(cfg, outs):
 
             args = [s, cfg, data_vec, conv_out, outs[0]]
             target = tvm.target.current_target(allow_none=False)
-            if _is_int8_hw_support(data.dtype, kernel.dtype, target):
-                # int8 conv kernel is 7-dim
-                _, _, kh, kw, _, _, _ = get_const_tuple(kernel.shape)
-                if kh == 1 and kw == 1:
-                    conv2d_avx_1x1._schedule_conv_NCHWc_int8(*args)
-                else:
-                    conv2d_avx_common._schedule_conv_NCHWc_int8(*args)
-            else:
             _, _, kh, kw, _, _, = get_const_tuple(kernel.shape)
             if kh == 1 and kw == 1:
                 conv2d_avx_1x1._schedule_conv_NCHWc(*args)

topi/python/topi/x86/conv2d_int8.py

+# 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=invalid-name,unused-variable,unused-argument,no-member
+"""Conv2D int8 schedule on x86"""
+
+import tvm
+from tvm import autotvm
+from .. import generic, tag
+from ..util import get_const_tuple
+from ..nn.conv2d import conv2d_NCHWc_int8
+from .. import nn
+from .conv2d import _get_default_config
+from . import conv2d_avx_1x1, conv2d_avx_common
+
+@autotvm.register_topi_compute(conv2d_NCHWc_int8, 'cpu', 'direct')
+def _declaration_conv_NCHWc_int8(cfg, data, kernel, strides,
+                                 padding, dilation, layout, out_layout, out_dtype):
+    n, ic_chunk, ih, iw, ic_bn = get_const_tuple(data.shape)
+    in_channel = ic_chunk * ic_bn
+    oc_chunk, _, kernel_height, kernel_width, _, oc_bn, _ = \
+            get_const_tuple(kernel.shape)
+    num_filter = oc_chunk * oc_bn
+
+    # If config is not set, we can reuse the default config for NCHW.
+    if cfg.is_fallback:
+        _get_default_config(cfg, tvm.placeholder((n, in_channel, ih, iw), dtype=data.dtype),
+                            tvm.placeholder((num_filter, in_channel, kernel_height, kernel_width),
+                                            dtype=kernel.dtype),
+                            strides, padding, out_dtype)
+    return nn.conv2d_NCHWc_int8_compute(data,
+                                        kernel,
+                                        strides,
+                                        padding,
+                                        dilation,
+                                        layout,
+                                        out_layout,
+                                        out_dtype)
+
+
+@autotvm.register_topi_schedule(generic.schedule_conv2d_NCHWc_int8, 'cpu', ['direct'])
+def _schedule_conv2d_NCHWc_int8(cfg, outs):
+    """Create schedule for tensors"""
+    s = tvm.create_schedule([x.op for x in outs])
+    scheduled_ops = []
+
+    def traverse(op):
+        """Traverse operators from computation graph"""
+        # inline all one-to-one-mapping operators except the last stage (output)
+        if tag.is_broadcast(op.tag):
+            if op not in s.outputs:
+                s[op].compute_inline()
+            for tensor in op.input_tensors:
+                if isinstance(tensor.op, tvm.tensor.ComputeOp) and tensor.op not in scheduled_ops:
+                    traverse(tensor.op)
+
+        if 'conv2d_NCHWc_int8' in op.tag:
+            conv_out = op.output(0)
+            kernel = conv_out.op.input_tensors[1]
+            data_vec = conv_out.op.input_tensors[0]
+            data = data_vec.op.input_tensors[0] \
+                if isinstance(data_vec.op, tvm.tensor.ComputeOp) and "pad" not in data_vec.op.tag \
+                else data_vec
+            if isinstance(data.op, tvm.tensor.ComputeOp) and "pad" in data.op.tag:
+                data_pad = data
+                data = data_pad.op.input_tensors[0]
+
+            args = [s, cfg, data_vec, conv_out, outs[0]]
+            target = tvm.target.current_target(allow_none=False)
+            # int8 conv kernel is 7-dim
+            _, _, kh, kw, _, _, _ = get_const_tuple(kernel.shape)
+            if kh == 1 and kw == 1:
+                conv2d_avx_1x1._schedule_conv_NCHWc_int8(*args)
+            else:
+                conv2d_avx_common._schedule_conv_NCHWc_int8(*args)
+
+        scheduled_ops.append(op)
+
+    traverse(outs[0].op)
+    return s
+
+@autotvm.register_topi_schedule(generic.schedule_conv2d_nhwc_pack, 'cpu', ['direct'])
+def schedule_conv2d_nhwc_pack(cfg, outs):
+    """Create schedule for tensors"""
+    s = tvm.create_schedule([x.op for x in outs])
+    output_op = outs[0].op
+    scheduled_ops = []
+
+    def traverse(op):
+        """Traverse operators from computation graph"""
+        # inline all one-to-one-mapping operators except the last stage (output)
+        if tag.is_broadcast(op.tag):
+            if op not in s.outputs:
+                s[op].compute_inline()
+            else: # inject custom schedule
+                if len(op.axis) == 4: # schedule bias + bn + relu
+                    n, h, w, c = op.axis
+                    fused = s[op].fuse(n, h, w)
+                    s[op].parallel(fused)
+                    s[op].vectorize(c)
+            for tensor in op.input_tensors:
+                if isinstance(tensor.op, tvm.tensor.ComputeOp) and tensor.op not in scheduled_ops:
+                    traverse(tensor.op)
+
+        if 'conv2d_nhwc_pack_int8' in op.tag:
+            conv_out = op.output(0)
+            kernel = conv_out.op.input_tensors[1]
+            data_vec = conv_out.op.input_tensors[0]
+            data = data_vec.op.input_tensors[0] \
+                if isinstance(data_vec.op, tvm.tensor.ComputeOp) and "pad" not in data_vec.op.tag \
+                else data_vec
+            if isinstance(data.op, tvm.tensor.ComputeOp) and "pad" in data.op.tag:
+                data_pad = data
+                data = data_pad.op.input_tensors[0]
+
+            args = [s, cfg, data_vec, conv_out, outs[0]]
+            if data.dtype == 'uint8':
+                kh, kw, _, _, _ = get_const_tuple(kernel.shape)
+                if kh == 1 and kw == 1:
+                    conv2d_avx_1x1._schedule_conv_nhwc_pack_int8(*args)
+                else:
+                    raise ValueError("Only support 1x1 kernel with "
+                                     "schedule_conv2d_nhwc_pack.")
+            else:
+                raise ValueError("Not support this data type {} with "
+                                 "schedule_conv2d_nhwc_pack. Only support int8".format(data.dtype))
+
+        scheduled_ops.append(op)
+    traverse(output_op)
+    return s