Module: FsrsRuby::Constants

Defined in:
lib/fsrs_ruby/constants.rb

Constant Summary collapse

DEFAULT_REQUEST_RETENTION =

Default configuration values

0.9
DEFAULT_MAXIMUM_INTERVAL = 
36500
DEFAULT_ENABLE_FUZZ = 
false
DEFAULT_ENABLE_SHORT_TERM = 
true
DEFAULT_LEARNING_STEPS = 
['1m', '10m'].freeze
DEFAULT_RELEARNING_STEPS = 
['10m'].freeze
S_MIN =

Stability bounds

0.001
S_MAX = 
36500.0
INIT_S_MAX = 
100.0
FSRS5_DEFAULT_DECAY =

Decay values

0.5
FSRS6_DEFAULT_DECAY = 
0.1542
W17_W18_CEILING =

W17_W18 ceiling for parameter clamping

2.0
DEFAULT_WEIGHTS =

Default weights (w through w)

[
  0.212,   # w[0]: initial stability (Again)
  1.2931,  # w[1]: initial stability (Hard)
  2.3065,  # w[2]: initial stability (Good)
  8.2956,  # w[3]: initial stability (Easy)
  6.4133,  # w[4]: initial difficulty (Good)
  0.8334,  # w[5]: initial difficulty (multiplier)
  3.0194,  # w[6]: difficulty (multiplier)
  0.001,   # w[7]: difficulty (multiplier)
  1.8722,  # w[8]: stability (exponent)
  0.1666,  # w[9]: stability (negative power)
  0.796,   # w[10]: stability (exponent)
  1.4835,  # w[11]: fail stability (multiplier)
  0.0614,  # w[12]: fail stability (negative power)
  0.2629,  # w[13]: fail stability (power)
  1.6483,  # w[14]: fail stability (exponent)
  0.6014,  # w[15]: stability (multiplier for Hard)
  1.8729,  # w[16]: stability (multiplier for Easy)
  0.5425,  # w[17]: short-term stability (exponent)
  0.0912,  # w[18]: short-term stability (exponent)
  0.0658,  # w[19]: short-term last-stability (exponent)
  FSRS6_DEFAULT_DECAY # w[20]: decay
].freeze

Class Method Summary collapse

Class Method Details

.clamp_parameters(w17_w18_ceiling, enable_short_term = true) ⇒ Object

Parameter clamping ranges Returns array of [min, max] pairs for each weight



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# File 'lib/fsrs_ruby/constants.rb', line 52

def self.clamp_parameters(w17_w18_ceiling, enable_short_term = true)
  [
    [S_MIN, INIT_S_MAX],           # w[0]: initial stability (Again)
    [S_MIN, INIT_S_MAX],           # w[1]: initial stability (Hard)
    [S_MIN, INIT_S_MAX],           # w[2]: initial stability (Good)
    [S_MIN, INIT_S_MAX],           # w[3]: initial stability (Easy)
    [1.0, 10.0],                   # w[4]: initial difficulty (Good)
    [0.001, 4.0],                  # w[5]: initial difficulty (multiplier)
    [0.001, 4.0],                  # w[6]: difficulty (multiplier)
    [0.001, 0.75],                 # w[7]: difficulty (multiplier)
    [0.0, 4.5],                    # w[8]: stability (exponent)
    [0.0, 0.8],                    # w[9]: stability (negative power)
    [0.001, 3.5],                  # w[10]: stability (exponent)
    [0.001, 5.0],                  # w[11]: fail stability (multiplier)
    [0.001, 0.25],                 # w[12]: fail stability (negative power)
    [0.001, 0.9],                  # w[13]: fail stability (power)
    [0.0, 4.0],                    # w[14]: fail stability (exponent)
    [0.0, 1.0],                    # w[15]: stability (multiplier for Hard)
    [1.0, 6.0],                    # w[16]: stability (multiplier for Easy)
    [0.0, w17_w18_ceiling],        # w[17]: short-term stability (exponent)
    [0.0, w17_w18_ceiling],        # w[18]: short-term stability (exponent)
    [enable_short_term ? 0.01 : 0.0, 0.8], # w[19]: short-term last-stability (exponent)
    [0.1, 0.8]                     # w[20]: decay
  ]
end