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- '''
- This is a module defining some constants.
- Translated from Zaikun Zhang's modern-Fortran reference implementation in PRIMA.
- Dedicated to late Professor M. J. D. Powell FRS (1936--2015).
- Python translation by Nickolai Belakovski.
- '''
- import numpy as np
- import os
- DEBUGGING = bool(os.getenv('PRIMA_DEBUGGING'))
- REALMIN = np.finfo(float).tiny
- REALMAX = np.finfo(float).max
- FUNCMAX = 10.0**30
- CONSTRMAX = FUNCMAX
- EPS = np.finfo(float).eps
- # Any bound with an absolute value at least BOUNDMAX is considered as no bound.
- BOUNDMAX = REALMAX/4
- # Some default values
- RHOBEG_DEFAULT = 1
- RHOEND_DEFAULT = 1e-6
- FTARGET_DEFAULT = -REALMAX
- CTOL_DEFAULT = np.sqrt(EPS)
- CWEIGHT_DEFAULT = 1e8
- ETA1_DEFAULT = 0.1
- ETA2_DEFAULT = 0.7
- GAMMA1_DEFAULT = 0.5
- GAMMA2_DEFAULT = 2
- IPRINT_DEFAULT = 0
- MAXFUN_DIM_DEFAULT = 500
- PRIMA_MAX_HIST_MEM_MB = 300 # 1MB > 10^5*REAL64. 100 can be too small.
- # Maximal amount of memory (Byte) allowed for XHIST, FHIST, CONHIST, CHIST, and the filters.
- MHM = PRIMA_MAX_HIST_MEM_MB * 10**6
- # Make sure that MAXHISTMEM does not exceed HUGE(0) to avoid overflow and memory errors.
- MAXHISTMEM = min(MHM, np.iinfo(np.int32).max)
- # Maximal length of the filter used in constrained solvers.
- MIN_MAXFILT = 200 # Should be positive; < 200 is not recommended.
- MAXFILT_DEFAULT = 10 * MIN_MAXFILT
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