put inf as ld_score value for typed snps

raiss/windows.py

@@ -72,7 +72,7 @@ def prepare_zscore_for_imputation(ref_panel, zscore):
     zscore = realigned_zfiles_on_panel(ref_panel, zscore)
     zscore['Var'] = -1.0
     zscore['Nsnp_to_impute'] = -1
-    zscore['ld_score'] = -1.0
+    zscore['ld_score'] = np.inf
     #zscore = zscore.loc[zscore.index.intersection(ref_panel.index)]
     return zscore