PiecewiseLinearToMIP

(class from pyomo.contrib.piecewise.transform.piecewise_to_mip_visitor)

class pyomo.contrib.piecewise.transform.piecewise_to_mip_visitor.PiecewiseLinearToMIP(transform_pw_linear_expression, transBlock)

Bases: StreamBasedExpressionVisitor

Expression walker to replace PiecewiseLinearExpressions when creating equivalent MIP formulations.

Parameters:

• transform_pw_linear_expression (function) – a callback that accepts a PiecewiseLinearExpression, its parent PiecewiseLinearFunction, and a transformation Block. It is expected to convert the PiecewiseLinearExpression to MIP form, and return the Var (or other expression) that will replace it in the expression.

• transBlock (Block) – transformation Block to pass to the above callback

__init__(transform_pw_linear_expression, transBlock)

Methods

__init__(transform_pw_linear_expression, ...)
beforeChild(node, child, child_idx)
exitNode(node, data)
initializeWalker(expr)
walk_expression(expr)	Walk an expression, calling registered callbacks.
walk_expression_nonrecursive(expr)	Nonrecursively walk an expression, calling registered callbacks.

Attributes

client_methods
finalizeResult

Member Documentation

walk_expression(expr)

Walk an expression, calling registered callbacks.

This is the standard interface for running the visitor. It defaults to using an efficient recursive implementation of the visitor, falling back on walk_expression_nonrecursive() if the recursion stack gets too deep.

walk_expression_nonrecursive(expr)

Nonrecursively walk an expression, calling registered callbacks.

This routine is safer than the recursive walkers for deep (or unbalanced) trees. It is, however, slightly slower than the recursive implementations.