Interface refactoring

Find a design which is more intuitive and minimal.

codes/kwant_helper/utils.py

@@ -237,10 +237,8 @@ def build_interacting_syst(builder, lattice, func_onsite, func_hop, max_neighbor
     return int_builder
 
 
-def generate_guess(nk, tb_model, int_model, scale=0.1):
+def generate_guess(tb_model, int_model, scale=0.1):
     """
-    nk : int
-        Number of k-points along each direction.
     tb_model : dict
         Tight-binding model of non-interacting systems.
     int_model : dict
@@ -250,8 +248,8 @@ def generate_guess(nk, tb_model, int_model, scale=0.1):
 
     Returns:
     --------
-    guess : nd-array
-        Guess evaluated on a k-point grid.
+    guess : tb dictionary
+        TB guess.
     """
     ndof = tb_model[next(iter(tb_model))].shape[-1]
     guess = {}
@@ -263,9 +261,9 @@ def generate_guess(nk, tb_model, int_model, scale=0.1):
         if np.linalg.norm(np.array(vector)):
             rand_hermitian += rand_hermitian.T.conj()
             rand_hermitian /= 2
-        guess[vector] = rand_hermitian
+        guess[vector] = rand_hermitian * scale
 
-    return kgrid_hamiltonian(nk, guess) * scale
+    return guess
 
 
 def hk2tb_model(hk, tb_model, int_model, ks=None):