def _compute_correlation(n, q, i, j):
# location in data1
y1 = i * stride1 + max_displacement
x1 = j * stride1 + max_displacement
# location in data2
y2 = y1 + (te.indexdiv(q, displacement_size) - displacement_radius) * stride2
x2 = x1 + (te.indexmod(q, displacement_size) - displacement_radius) * stride2
return te.sum(corr_func(padded_data1[n, rc, y1 + ry, x1 + rx],
padded_data2[n, rc, y2 + ry, x2 + rx]), axis=[rc, ry, rx])
def convert_to_nhwc_compute(tensor: te.Tensor, layout: str,
channels: int) -> te.Tensor:
"""Converts a tensor into NHWC layout if it's in NHWCB16 layout.
When the current layout is NHCWB16, a reduce sum operation is inserted
to ensure that the whole of the input tensor has a data dependency on
the copy operation. Without this, TVM removes compute that is deemed to
be unnecessary, which causes strides for the NPU to be calculated
incorrectly.
Parameters
----------
tensor : te.Tensor
The tensor to convert.
layout : str
The layout of the tensor, either NHWC or NHCWB16.
channels : int
The number of valid channels for the tensor.
Returns
-------
te.Tensor
The converted tensor in NHWC layout.
"""
assert layout in {"NHWC", "NHCWB16"}
convert_to_nhwc_attrs = {
"op": "ethosu_convert_to_nhwc",
"layout": layout,
}
if layout == "NHCWB16":
rc = te.reduce_axis((0, 16), name="rc")
return te.compute(
(tensor.shape[0], tensor.shape[1], tensor.shape[3], channels),
lambda nn, hh, ww, cc: te.sum(tensor(nn, hh, te.indexdiv(cc, 16),
ww, te.indexmod(rc, 16)),
axis=rc),
name="ethosu_convert_to_nhwc",
attrs=convert_to_nhwc_attrs,
)
return te.compute(
tensor.shape,
lambda *i: tensor(*i),
name="ethosu_convert_to_nhwc",
attrs=convert_to_nhwc_attrs,
)
def convert_to_nhwc_compute(tensor: te.Tensor, layout: str,
channels: int) -> te.Tensor:
"""Converts a tensor into NHWC layout if it's in NHWCB16 layout.
Parameters
----------
tensor : te.Tensor
The tensor to convert.
layout : str
The layout of the tensor, either NHWC or NHCWB16.
channels : int
The number of valid channels for the tensor.
Returns
-------
te.Tensor
The converted tensor in NHWC layout.
"""
assert layout in {"NHWC", "NHCWB16"}
convert_to_nhwc_attrs = {
"op": "ethosu_convert_to_nhwc",
"layout": layout,
}
if layout == "NHCWB16":
return te.compute(
(tensor.shape[0], tensor.shape[1], tensor.shape[3], channels),
lambda nn, hh, ww, cc: tensor(nn, hh, te.indexdiv(cc, 16), ww,
te.indexmod(cc, 16)),
name="ethosu_convert_to_nhwc",
attrs=convert_to_nhwc_attrs,
)
return te.compute(
tensor.shape,
lambda *i: tensor(*i),
name="ethosu_convert_to_nhwc",
attrs=convert_to_nhwc_attrs,
)