Descriptor,          		Description of Descriptor
 ‘formation_energy’,  	Formation energy
 'elem_frac',  			Relative fraction of elements in the structure
 'elem_list',			List of elements in the structure
 'energy',				DFT total energy
 'formula',				Formula
 'magnetic_moment’,		Magnetic moment per unit cell [uB]
 'spin_index',			Spin index: 0 - FM, 1 - AFM
 'num_p',				Number of p electrons
 'num_d',				Number of d electrons
 'num_f',				Number of f electrons
 'atomic_rad',			Atomic radius of the atoms in the structure
 'atomic_vol',			Atomic volume of the atoms in the structure
 'covalent_rad',			Covalent radius of the atoms in the structure
 'dipole',				Dipole polarizability of the atoms in the structure
 'eaffinity',			Electron affinity of the atoms in the structure
 'num_electrons',			Number of electrons 
 'atomic_rad_sum_dif',	Sum of the differences of atomic radii
 'atomic_rad_std_dif',	Standard deviation of the differences of atomic radii
 'atomic_rad_std',		Standard deviation of the atomic radii
 'atomic_rad_avg',		Mean of the atomic radii
 'atomic_rad_max_dif',	Maximum difference of the atomic radii
 'atomic_vol_sum_dif',	Sum of the differences of the atomic volumes of the atoms
 'atomic_vol_std_dif',	Standard deviation of the differences of atomic volumes of the atoms
 'atomic_vol_std',		Standard deviation of the atomic volumes
 'atomic_vol_avg',		Mean of the atomic volumes
 'atomic_vol_max_dif'	,	Maximum difference of the atomic volumes
 'covalentrad_sum_dif	',	Sum of the differences of the covalent radii
 'covalentrad_std_dif	‘,	Standard deviation of the covalent radii
 'covalentrad_std',		Standard deviation of the covalent radii
 'covalentrad_avg',		Mean of the covalent radii
 'covalentrad_max_dif',	Maximum difference of the covalent radii
 'dipole_sum_dif',		Sum of the differences of the dipole polarizability of the atoms
 'dipole_std_dif',		Standard deviation of the differences of the dipole polarizability of the atoms
 'dipole_std',			Standard deviation of the dipole polarizability of the atoms
 'dipole_avg',			Mean of the dipole polarizability of the atoms
 'dipole_max_dif',		Maximum difference of the dipole polarizability of the atoms
 'eaffinity_sum_dif',		Sum of the differences of the electron affinity
 'eaffinity_std_dif',		Standard deviation of the differences of the electron affinity
 'eaffinity_std',			Standard deviation of the electron affinity
 'e_affinity_avg',		Mean of the electron affinity
 'e_affinity_max_dif',	Maximum difference of the electron affinity
 'numelectron_sum_dif',	Sum of the differences of the number of electrons of the atoms
 'numelectron_std_dif',	Standard deviation of the number of electrons of the atoms
 'numelectron_std',		Standard deviation of the number of electrons of the atoms
 'numelectron_avg',		Mean of the number of electrons of the atoms
 'numelectron_max_dif',	Maximum difference of the number of electrons of the atoms
 'vdwradius_sum_dif',		Sum of the differences of the van der Waals radii
 'vdwradius_std_dif’,		Standard deviation of the differences of van der Waals radii values
 'vdwradius_std',			Standard deviation of the van der Waals radii
 'vdwradius_avg',			Mean of the van der Waals radii 
 'vdwradius_max_dif',		Maximum difference of the van der Waals radii
 'e_negativity_sum_dif',	Sum of the differences of the electronegativity
 'e_negativity_std_dif',	Standard deviation of the differences of the electronegativity
 'e_negativity_std',		Standard deviation of the electronegativity
 'e_negativity_avg',		Mean of the electronegativity 
 'e_negativity_max_dif',  Maximum difference of the electronegativity
 'nvalence_sum_dif',		Sum of the differences of the number of valence electrons
 'nvalence_std_dif',		Standard deviation of the differences of the number of valence electrons
 'nvalence_std',			Standard deviation of the number of valence electrons
 'nvalence_avg',			Mean of the number of valence electrons
 'nvalence_max_dif',		Maximum difference of the number of valence electrons
 'lastsubshell_avg',		Mean of the number of electrons in the last subshell
 'cmpd_skew_p',			Skew of the number of p electrons of the atoms in the structure 
 'cmpd_skew_d',			Skew of the number of d electrons of the atoms in the structure 
 'cmpd_skew_f',			Skew of the number of f electrons of the atoms in the structure 
 'cmpd_sigma_p',			Standard deviation of the number of p electrons of the atoms in the structure 
 'cmpd_sigma_d',			Standard deviation of the number of d electrons of the atoms in the structure 
 'cmpd_sigma_f',			Standard deviation of the number of f electrons of the atoms in the structure 
 'frac_f ',				Fraction of f electrons
 'std_ion',				Standard deviation of the ionization energies
 'sum_ion',				Sum of the ionization energies
 'mean_ion',				Mean of the ionization energies
 'Born',					The Born-Haber term
 'hardness_mean',			Mean of the chemical hardness
 'hardness_var',			Variance of the chemical hardness
 'Nup_mean',				Mean of the number of unpaired electrons
 'Nup_var',				Variance of the number of unpaired electrons
 'cs_bob',				Bag of bonds chemical space representation
 'cs_PE',				Pauling electronegativity flavor of the Bag of bonds chemical space representation
 'cs_IR',				Ionic radius flavor of the Bag of bonds chemical space representation
 'cs_AR',				Atomic radius flavor or the Bag of bonds chemical space representation
 'cs_OX’,				Oxidation number flavor of the Bag of bonds chemical space representation