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CHANGELOG.md

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Changelog

All significant changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added

  • Check to make sure that a node's inventory_policy attribute is set, and that the Policy object's node attribute is set to the node
  • Set the Policy object's node attribute automatically when setting the node's inventory_policy to it

[0.0.14] -- 2022-08-17

Fixed

  • Bug in feature that allows overriding order quantities in simulation

[0.0.13] -- 2022-08-10

Added

  • Features to run simulation period-by-period instead of all at once (useful for using in a reinforcement learning (RL) context)
  • newsvendor.newsvendor_poisson_explicit() function added, for explicit-form newsvendor problem with Poisson demands
  • Various unit tests
  • More robust attribute handling for various objects

Changed

  • Allow earlier version of numpy (v1.21 insead of v1.22), which in turn allows Python 3.7 instead of 3.8
  • New format for storing and loading named instances, and better documentation
  • newsvendor.newsvendor_explicit() parameter renamed to revenue from selling_revenue for consistency

Fixed

  • State variables are stored as int and float instead of int64 and float64 so they can be JSON serialized when saving
  • Bug that created spurious entries in inbound_order_pipeline
  • Bug in which only order LT was respected in simulation if both order and shipment LTs are nonzero
  • Bug in default value for consistency_checks in simulation()

[0.0.12] -- 2022-07-12

Changed

  • Looser dependencies (previous versions required newer than necessary versions of some packages)

[0.0.11] -- 2022-07-11 -- YANKED

[0.0.10] -- 2022-07-11 -- YANKED

[0.0.9] -- 2022-06-28

Added

  • Methods to convert objects to and from dicts

Changed

  • Removed dependency on pandas

Fixed

  • Bug that prevented named instances from being loaded correctly using load_instance()

[0.0.8] -- 2022-06-27

Changed

  • Removed cost summary output and print_cost_summary option from sim_io.write_results()

[0.0.7] -- 2022-06-27

Fixed

  • Small issue in README file

[0.0.6] -- 2022-06-27

Added

  • Various new unit tests

Fixed

  • Bug in supply_chain_network.echelon_to_local_base_stock_levels()

[0.0.5] -- 2022-06-25

Added

  • Named instances from Shang and Song (2003)
  • More flexible options for node indexing in ssm_serial.optimize_base_stock_levels() and ssm_serial.newsvendor_heuristic()
  • More flexible options for choosing rows and columns in simulation output in write_results()
  • Better handling of disrupted items for type-RP disruptions
  • Various new unit tests

Changed

  • Smarter initialization of inventory levels in simulation
  • ssm_serial.optimize_base_stock_levels() recognizes if demand distribution is discrete and handles discretization accordingly
  • Default disruption type changed to 'OP'

Fixed

  • Bug in order quantity with type-RP disruptions

[0.0.4] -- 2022-06-14

Added

  • Various new unit tests
  • Ability to pass kwargs to SupplyChainNetwork()
  • owmr_system() function to build OWMR networks

Changed

  • Improved flexibility of inputs in network_from_edges()

Fixed

  • Bug in which inbound_order_pipeline was initialized incorrectly in simulation

[0.0.3] -- 2022-06-11

Added

  • Various new unit tests.
  • Improved documentation throughout.
  • Feature to check for duplicate edges when adding edges to a network.
  • Feature to check for directed cycles before running simulation.

Fixed

  • Various bugs in backorder calculations in simulation, especially with disruptions.

[0.0.2] -- 2022-06-06

Fixed

  • Fix problems with setup that prevented installation via pip.

[0.0.1] -- 2022-06-02

Initial release.