Styjun

I have the following decision tree taken from this example with little modification. When I added two sub-nodes to the second right node, the inner left and inner right nodes have been overlapped. How can I separate those nodes?

documentclassarticle
usepackagetikz
usetikzlibrarypositioning
newdimennodeDist
nodeDist=35mm
begindocument

begintikzpicture[
 node/.style=%
 draw,
 rectangle,
 ,
 ]

 node [node] (A) SimilarityScore1;
 path (A) ++(-135:nodeDist) node [node] (B)loooooongeteeext;
 path (A) ++(-45:nodeDist) node [node] (C) loooooongeteeext;
 path (C) ++(-135:nodeDist) node [node] (D) loooooongeteeext;
 path (C) ++(-45:nodeDist) node [node] (E) loooooongeteeext;
 path (B) ++(-135:nodeDist) node [node] (F) loooooongeteeext;
 path (B) ++(-45:nodeDist) node [node] (G) loooooongeteeext;

 draw (A) -- (B) node [left,pos=0.25] $<= 0.904712$(A);
 draw (A) -- (C) node [right,pos=0.25] $> 0.904712$(A);
 draw (C) -- (D) node [left,pos=0.25] $<= 0.896089$(A);
 draw (C) -- (E) node [right,pos=0.20] $> 0.896089$(A);
 draw (B) -- (F) node [left,pos=0.2] $<= 0.997372$(A);
 draw (B) -- (G) node [right,pos=0.20] $> 0.997372$(A);
endtikzpicture

enddocument

Thanks in advance

You have to change either the lengths of the connectors or the angles. Or both, here's a suggestion that does both to achieve something I'd find reasonable:

documentclassarticle
usepackagetikz
usetikzlibrarypositioning
newdimennodeDist
nodeDist=25mm
newdimennodeDistUpper
nodeDistUpper=40mm
begindocument

begintikzpicture[
 node/.style=%
 draw,
 rectangle,
 ,
 ]

 node [node] (A) SimilarityScore1;
 path (A) ++(-157.5:nodeDistUpper) node [node] (B)loooooongeteeext;
 path (A) ++(-22.5:nodeDistUpper) node [node] (C) loooooongeteeext;
 path (C) ++(-135:nodeDist) node [node] (D) loooooongeteeext;
 path (C) ++(-45:nodeDist) node [node] (E) loooooongeteeext;
 path (B) ++(-135:nodeDist) node [node] (F) loooooongeteeext;
 path (B) ++(-45:nodeDist) node [node] (G) loooooongeteeext;

 draw (A) -- (B) node [left,pos=0.25] $leq 0.904712$(A);
 draw (A) -- (C) node [right,pos=0.25] $> 0.904712$(A);
 draw (C) -- (D) node [left,pos=0.25] $geq 0.896089$(A);
 draw (C) -- (E) node [right,pos=0.20] $> 0.896089$(A);
 draw (B) -- (F) node [left,pos=0.2] $leq 0.997372$(A);
 draw (B) -- (G) node [right,pos=0.20] $> 0.997372$(A);
endtikzpicture

enddocument

another diferently approach. since your diagram is tree (decision) diagram, it can be easy draw by help of the forest package:

documentclass[border=5mm]standalone
usepackageforest

begindocument
forestsetEL/.style 2 args=edge label=%
 node[midway, font=footnotesize, 
 inner sep=2pt, anchor=south #1]$#2$,
 ,
 % end of forestset

beginforest
for tree=
 draw,
 l sep=17 mm,
 s sep= 1 mm,
 % end of for tree
[SimilarityScore1
 [loooooongeteeext, EL=eastleq 0.904712,
 [loooooongeteeext,EL=eastleq 0.896089]
 [loooooongeteeext,EL=westgeq 0.896089]
 ]
 [loooooongeteeext, EL=westgeq 0.904712
 [loooooongeteeext,EL=eastleq 0.896089]
 [loooooongeteeext,EL=westgeq 0.896089]
 ]
]
endforest
enddocument

addendum:
based on answers on my question is possible to slightly improve (make shorter code for tree) above mwe:

documentclass[border=3mm, preview]standalone
usepackageforest

begindocument
tikzsetELS/.style=% Edge Label Style
 font=footnotesizesffamily, inner sep=2pt,
 anchor=south #1, % label position: "ELS=west" or "EL=east"
 pos=0.6
 
 beginforest
for tree=
 draw,
 semithick,
 parent anchor=children,
 l sep=13 mm,
 s sep=4mm,
 where level=1s sep=1mm % <---
 ,
 EL/.style = % <---
 before typesetting nodes=%
 where n=1%
 edge label/.wrap value=node[ELS=east]$#1$
 %
 edge label/.wrap value=node[ELS=west]$#1$
 
 
 
[SimilarityScore1
 [loooooongeteeext, EL=leq 0.904712 
 [loooooongeteeext,EL=leq 0.896089]
 [loooooongeteeext,EL=geq 0.896089]
 ]
 [loooooongeteeext, EL=geq 0.904712
 [loooooongeteeext,EL=leq 0.896089]
 [loooooongeteeext,EL=geq 0.896089]
 ]
]
 endforest
enddocument

which gives nicer result:

An entirely differnt approach that would allow you to make this whole approach a bit more general is to do something like this. This would also help you if you have more than one trees and they do not all share the exact same structure

documentclassarticle
usepackagetikz
begindocument
 begintikzpicture[-,thick,
 level 1/.style=sibling distance=6cm,
 level 2/.style=sibling distance=2.5cm
 ]
 footnotesize
 node similarity score
 child node looooong text 1 
 child node looooong text 1a 
 child node looooong text 1b
 
 child node looooong text 2 
 child node looooong text 2a
 child node looooong text 2b
 
 ;
 endtikzpicture
enddocument

You can also add boxes and labels

documentclassarticle
usepackagetikz
begindocument
 begintikzpicture[-,thick,
 level 1/.style=sibling distance=6cm,
 level 2/.style=sibling distance=2.5cm, 
 box/.style=draw=blue!80
 ]
 footnotesize
 node[box] similarity score
 child node[box] looooong text 1 
 child node[box] looooong text 1a edge from parent node[left] $<3$ 
 child node[box] looooong text 1b edge from parent node[right] $geq3$ 
 edge from parent node[left] $<3$
 
 child node[box] looooong text 2 
 child node[box] looooong text 2a edge from parent node[left] $<3$
 child node[box] looooong text 2b edge from parent node[right] $geq3$
 edge from parent node[right] $geq3$
 
 ;
 endtikzpicture
enddocument