# tensorplay.functional.fake_quantize_per_tensor_affine

Source: https://www.tensorplay.cn/docs/generated/tensorplay.functional.fake_quantize_per_tensor_affine.html

```python
tensorplay.functional.fake_quantize_per_tensor_affine(input, scale, zero_point, quant_min, quant_max) → Tensor
```

Returns a new tensor with the data in input fake quantized using scale,
zero_point, quant_min and quant_max.

$$\text{output} = (
    min(
        \text{quant\_max},
        max(
            \text{quant\_min},
            \text{std::nearby\_int}(\text{input} / \text{scale}) + \text{zero\_point}
        )
    ) - \text{zero\_point}
) \times \text{scale}$$

Parameters:

- input ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – the input value(s), tensorplay.float32 tensor

- scale (double scalar or float32 Tensor) – quantization scale

- zero_point (int64 scalar or int32 Tensor) – quantization zero_point

- quant_min (int64) – lower bound of the quantized domain

- quant_max (int64) – upper bound of the quantized domain

Returns:

A newly fake_quantized tensorplay.float32 tensor

Return type:

[Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)

Example:

```
>>> x = tensorplay.randn(4)
>>> x
tensor([ 0.0552,  0.9730,  0.3973, -1.0780])
>>> tensorplay.fake_quantize_per_tensor_affine(x, 0.1, 0, 0, 255)
tensor([0.1000, 1.0000, 0.4000, 0.0000])
>>> tensorplay.fake_quantize_per_tensor_affine(x, tensorplay.tensor(0.1), tensorplay.tensor(0), 0, 255)
tensor([0.1000, 1.0000, 0.4000, 0.0000])
```