com.microsoft - DequantizeLinear#
DequantizeLinear - 1 (com.microsoft)#
Version
domain: com.microsoft
since_version: 1
function:
support_level:
shape inference:
This version of the operator has been available since version 1 of domain com.microsoft.
Summary
The linear dequantization operator. It consumes a quantized data, a scale, a zero point and computes the full precision data. The dequantization formula is y = (x - x_zero_point) * x_scale. Scale and zero point must have same shape. They must be either scalar (per tensor) or 1-D tensor (per ‘axis’).
Attributes
axis: The axis along which same quantization parameters are applied. It’s optional.If it’s not specified, it means per-tensor quantization and input ‘x_scale’ and ‘x_zero_point’ must be scalars.If it’s specified, it means per ‘axis’ quantization and input ‘x_scale’ and ‘x_zero_point’ must be 1-D tensors. Default value is
?
.
Inputs
x (heterogeneous) - T1: N-D quantized Input tensor to be de-quantized.
x_scale (heterogeneous) - T2: Scale for input ‘x’. It could be a scalar or a 1-D tensor, which means a per-tensor or per-axis quantization.If it’s a 1-D tensor, its number of elements should be equal to the dimension value of ‘axis’ dimension of input ‘x’.
x_zero_point (heterogeneous) - T1: Zero point for input ‘x’. It could be a scalar or a 1-D tensor, which means a per-tensor or per-axis quantization.If it’s a 1-D tensor, its number of elements should be equal to the dimension value of ‘axis’ dimension of input ‘x’.
Outputs
y (heterogeneous) - T2: N-D full precision output tensor. It has same shape as input ‘x’.
Examples
default
node = onnx.helper.make_node(
"DequantizeLinear",
inputs=["x", "x_scale", "x_zero_point"],
outputs=["y"],
)
# scalar zero point and scale
x = np.array([0, 3, 128, 255]).astype(np.uint8)
x_scale = np.float32(2)
x_zero_point = np.uint8(128)
y = np.array([-256, -250, 0, 254], dtype=np.float32)
expect(
node,
inputs=[x, x_scale, x_zero_point],
outputs=[y],
name="test_dequantizelinear",
)
_axis
node = onnx.helper.make_node(
"DequantizeLinear",
inputs=["x", "x_scale", "x_zero_point"],
outputs=["y"],
)
# 1-D tensor zero point and scale of size equal to axis 1 of the input tensor
x = np.array(
[
[
[[3, 89], [34, 200], [74, 59]],
[[5, 24], [24, 87], [32, 13]],
[[245, 99], [4, 142], [121, 102]],
],
],
dtype=np.uint8,
)
x_scale = np.array([2, 4, 5], dtype=np.float32)
x_zero_point = np.array([84, 24, 196], dtype=np.uint8)
y = (
x.astype(np.float32) - x_zero_point.reshape(1, 3, 1, 1).astype(np.float32)
) * x_scale.reshape(1, 3, 1, 1)
expect(
node,
inputs=[x, x_scale, x_zero_point],
outputs=[y],
name="test_dequantizelinear_axis",
)