BaseNNConstr

class gurobi_ml.modeling.neuralnet.neural_net.BaseNNConstr(gp_model, predictor, input_vars, output_vars, **kwargs)

Bases: AbstractPredictorConstr

Base class for inserting a regressor based on a neural-network/tensor into Gurobi.

This only supports sequential neural networks.

The bracket operator can be used to iterate over the layers of the layers of the network. It will give access to the modeling object of the corresponding layer.

Attributes:

constrs

List of linear constraints added.

default_name

Default base name base used for automatic name generation.

genconstrs

List of general constraints added.

gp_model

Access gurobipy model this is a part of.

input

Input variables of embedded predictor.

input_values

Values for the input variables if a solution is known.

layers

Access models for successive layers of the network

output

Output variables of embedded predictor.

output_values

Values for the output variables if a solution is known.

qconstrs

List of quadratic constraints added.

sos

List of SOS constraints added.

vars

List of variables added.

Methods

get_error(eps)	Returns error in Gurobi's solution with respect to prediction from input.
print_stats([abbrev, file])	Print statistics about submodel created.
remove()	Remove from gp_model everything that was added to embed predictor.

abstractmethod get_error(eps)

Returns error in Gurobi’s solution with respect to prediction from input.

Returns:

error – Assuming that we have a solution for the input and output variables x, y. Returns the absolute value of the differences between predictor.predict(x) and y. Where predictor is the regression model represented by this object.

Return type:

ndarray of same shape as gurobi_ml.modeling.base_predictor_constr.AbstractPredictorConstr.output

Raises:

NoSolution – If the Gurobi model has no solution (either was not optimized or is infeasible).

print_stats(abbrev=False, file=None)

Print statistics about submodel created.

Parameters:

file (None, optional) – Text stream to which output should be redirected. By default sys.stdout.

remove()

Remove from gp_model everything that was added to embed predictor.

property constrs

List of linear constraints added.

property default_name

Default base name base used for automatic name generation.

property genconstrs

List of general constraints added.

property gp_model

Access gurobipy model this is a part of.

property input

Input variables of embedded predictor.

Returns:

output

Return type:

MVar.

property input_values

Values for the input variables if a solution is known.

Returns:

output_value

Return type:

ndarray or pandas dataframe with values

Raises:

NoSolution – If the Gurobi model has no solution (either was not optimized or is infeasible).

property layers

Access models for successive layers of the network

property output

Output variables of embedded predictor.

Returns:

output

Return type:

MVar.

property output_values

Values for the output variables if a solution is known.

Returns:

output_value

Return type:

ndarray or pandas dataframe with values

Raises:

NoSolution – If the Gurobi model has no solution (either was not optimized or is infeasible).

property qconstrs

List of quadratic constraints added.

property sos

List of SOS constraints added.

property vars

List of variables added.