# chain\_dot

Returns the dot product of multiple vectors represented as dicts.

## Examples

```python
from river import utils

x = {'x0': 1, 'x1': 2, 'x2': 1}
y = {'x1': 21, 'x2': 3}
z = {'x1': 2, 'x2': 1 / 3}

utils.math.chain_dot(x, y, z)
```

```text
85.0
```