# tensorplay.functional.quantize_per_tensor

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

```python
tensorplay.functional.quantize_per_tensor(input, scale, zero_point, dtype) → Tensor
```

Converts a float tensor to a quantized tensor with given scale and zero point.

Parameters:

- input ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – float tensor or list of tensors to quantize

- scale ([float](https://docs.python.org/3/builtins/functions.html#float) or [Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – scale to apply in quantization formula

- zero_point ([int](https://docs.python.org/3/builtins/functions.html#int) or [Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – offset in integer value that maps to float zero

- dtype ([tensorplay.dtype](/docs/generated/tensorplay.DType.html#tensorplay.DType)) – the desired data type of returned tensor. Has to be one of the quantized dtypes: tensorplay.quint8, tensorplay.qint8, tensorplay.qint32

Returns:

A newly quantized tensor or list of quantized tensors.

Return type:

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

Example:

```
>>> tensorplay.quantize_per_tensor(tensorplay.tensor([-1.0, 0.0, 1.0, 2.0]), 0.1, 10, tensorplay.quint8)
tensor([-1.,  0.,  1.,  2.], size=(4,), dtype=tensorplay.quint8,
       quantization_scheme=tensorplay.per_tensor_affine, scale=0.1, zero_point=10)
>>> tensorplay.quantize_per_tensor(tensorplay.tensor([-1.0, 0.0, 1.0, 2.0]), 0.1, 10, tensorplay.quint8).int_repr()
tensor([ 0, 10, 20, 30], dtype=tensorplay.uint8)
>>> tensorplay.quantize_per_tensor([tensorplay.tensor([-1.0, 0.0]), tensorplay.tensor([-2.0, 2.0])],
>>> tensorplay.tensor([0.1, 0.2]), tensorplay.tensor([10, 20]), tensorplay.quint8)
(tensor([-1.,  0.], size=(2,), dtype=tensorplay.quint8,
    quantization_scheme=tensorplay.per_tensor_affine, scale=0.1, zero_point=10),
    tensor([-2.,  2.], size=(2,), dtype=tensorplay.quint8,
    quantization_scheme=tensorplay.per_tensor_affine, scale=0.2, zero_point=20))
>>> tensorplay.quantize_per_tensor(tensorplay.tensor([-1.0, 0.0, 1.0, 2.0]), tensorplay.tensor(0.1), tensorplay.tensor(10), tensorplay.quint8)
tensor([-1.,  0.,  1.,  2.], size=(4,), dtype=tensorplay.quint8,
   quantization_scheme=tensorplay.per_tensor_affine, scale=0.10, zero_point=10)
```