giuseros commented on a change in pull request #6095:
URL: https://github.com/apache/incubator-tvm/pull/6095#discussion_r459455600



##########
File path: topi/python/topi/arm_cpu/depthwise_conv2d.py
##########
@@ -181,6 +181,170 @@ def depthwise_conv2d_nchw_spatial_pack(cfg, data, kernel, 
strides, padding, dila
 
     return _decl_spatial_pack(cfg, data, kernel, strides, padding, dilation, 
out_dtype, num_tile=2)
 
+@autotvm.register_topi_compute("depthwise_conv2d_nhwc.arm_cpu")
+def compute_depthwise_conv2d_nhwc(_, data, kernel, strides, padding, dilation, 
out_dtype):
+    """TOPI compute callback for depthwise_conv2d nhwc
+
+    Parameters
+    ----------
+    cfg: ConfigEntity
+        The config for this template
+
+    data : tvm.te.Tensor
+        4-D with shape [batch, in_height, in_width, in_channel]
+
+    kernel : tvm.te.Tensor
+        4-D with shape [filter_height, filter_width, in_channel, 
channel_multiplier]
+
+    strides : list of two ints
+        [stride_height, stride_width]
+
+    padding : list of two ints
+        [pad_height, pad_width]
+
+    dilation : list of two ints
+        [dilation_height, dilation_width]
+
+    out_dtype: str
+        The output type. This is used for mixed precision.
+
+    Returns
+    -------
+    output : tvm.te.Tensor
+        4-D with shape [batch, out_height, out_width, out_channel]
+    """
+
+    out_dtype = out_dtype or data.dtype
+
+    N, IH, IW, IC = get_const_tuple(data.shape)
+
+    if isinstance(dilation, int):
+        dilation_h = dilation_w = dilation
+    else:
+        dilation_h, dilation_w = dilation
+
+    KH, KW, IC, channel_multiplier = get_const_tuple(kernel.shape)
+
+    dilated_kernel_h = (KH - 1) * dilation_h + 1
+    dilated_kernel_w = (KW - 1) * dilation_w + 1
+
+    pad_top, pad_left, pad_down, pad_right = get_pad_tuple(
+        padding, (dilated_kernel_h, dilated_kernel_w))
+    HSTR, WSTR = strides if isinstance(strides, (tuple, list)) else (strides, 
strides)
+
+    OH = (IH + pad_top + pad_down - dilated_kernel_h) // HSTR + 1
+    OW = (IW + pad_left + pad_right - dilated_kernel_w) // WSTR + 1
+
+    if pad_top or pad_left or pad_down or pad_right:
+        data_pad = nn.pad(data, [0, pad_top, pad_left, 0], [0, pad_down, 
pad_right, 0],
+                          name="data_pad")
+    else:
+        data_pad = data
+
+    output_shape = (N, OH, OW, IC*channel_multiplier)
+
+    idxdiv = tvm.tir.indexdiv
+    idxmod = tvm.tir.indexmod
+
+    reduce_h = te.reduce_axis((0, KH), name='reduce_h')
+    reduce_w = te.reduce_axis((0, KW), name='reduce_w')
+
+    out = te.compute(output_shape, lambda n, h, w, c:
+                     te.sum(data_pad[n,
+                                     HSTR*h+dilation_h*reduce_h,
+                                     w*WSTR+reduce_w*dilation_w,
+                                     idxdiv(c, 
channel_multiplier)].astype(out_dtype) *
+                            kernel[reduce_h,
+                                   reduce_w,
+                                   idxdiv(c, channel_multiplier),
+                                   idxmod(c, 
channel_multiplier)].astype(out_dtype),
+                            axis=[reduce_h, reduce_w]),
+                     name='depthwise_conv2d_nhwc_output')
+    return out
+
+@autotvm.register_topi_schedule("depthwise_conv2d_nhwc.arm_cpu")
+def schedule_depthwise_conv2d_nhwc(cfg, outs):
+    """Create the schedule for depthwise_conv2d_nchw_spatial_pack"""
+    outs = [outs] if isinstance(outs, te.tensor.Tensor) else outs
+    s = te.create_schedule([x.op for x in outs])
+    out = outs[0]
+
+    ##### space definition begin #####
+    n, h, w, c = s[out].op.axis
+    cfg.define_split('tile_c', c, num_outputs=2)
+    _, hi = cfg.define_split('tile_h', h, num_outputs=2)
+    _, wi = cfg.define_split('tile_w', w, num_outputs=2)
+    cfg.define_knob('locate_output', [0, 1])
+
+    # fallback support
+    if cfg.is_fallback:
+        cfg['tile_c'] = SplitEntity([-1, 8])
+        cfg['tile_h'] = SplitEntity([-1, 2])
+        cfg['tile_w'] = SplitEntity([-1, 2])
+        cfg['locate_output'] = OtherOptionEntity(1)
+    ##### space definition end #####
+
+    def schedule_conv(conv):
+        conv_data = conv.op.input_tensors[0]
+
+        n, w, h, c = conv.op.axis
+        r_h, r_w = conv.op.reduce_axis
+        ho, hi = cfg['tile_h'].apply(s, conv, h)
+        wo, wi = cfg['tile_w'].apply(s, conv, w)
+        co, ci = cfg['tile_c'].apply(s, conv, c)
+
+        if conv_data.name == "data_pad":
+            # Define a policy for padding computation

Review comment:
       Done. 




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