Merge pull request google#239 from mblondel:lbfgs_bug2

PiperOrigin-RevId: 454228985

Merge pull request google#238 from mblondel:release_0.4.1

PiperOrigin-RevId: 454153017

Merge pull request google#222 from mblondel:release_0.4

PiperOrigin-RevId: 450624805

Merge pull request google#182 from mblondel:release_0.3.1

PiperOrigin-RevId: 431517676

Merge pull request google#158 from mblondel:release-0.3

PiperOrigin-RevId: 425351297

Merge pull request google#135 from mblondel:release_v0.2

PiperOrigin-RevId: 417064937

Merge pull request google#85 from mblondel:version_0.1.1

PiperOrigin-RevId: 404245958

Merge pull request google#73 from mblondel:fix_setup

PiperOrigin-RevId: 403055132