# modopt.approximate_hessians

```{eval-rst}

.. autosummary::
    modopt.approximate_hessians.BFGS
    modopt.approximate_hessians.BFGSScipy
    modopt.approximate_hessians.SR1
    modopt.approximate_hessians.DFP
    modopt.approximate_hessians.PSB

```

```{eval-rst}

.. autoclass:: modopt.approximate_hessians.BFGS
    :members: update

.. autoclass:: modopt.approximate_hessians.BFGSScipy
    :members: update

.. autoclass:: modopt.approximate_hessians.SR1
    :members: update

.. autoclass:: modopt.approximate_hessians.DFP
    :members: update

.. autoclass:: modopt.approximate_hessians.PSB
    :members: update
```