.. _method-coliny_solis_wets-contract_after_failure:

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contract_after_failure
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The number of unsuccessful cycles prior to contraction.


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**Specification**

- *Alias:* None

- *Arguments:* INTEGER

- *Default:* 4*number of variables


**Description**


In particular, ``coliny_solis_wets`` supports dynamic rescaling of the
step length, and dynamic rescaling of the constraint penalty. The only
new specification is ``contract_after_failure``, which specifies the
number of unsuccessful cycles which must occur with a specific delta
prior to contraction of the delta.