I'm trying to use the dtreeviz library to visualize a decision tree, but I’m encountering an error: TypeError: 'int' object is not subscriptable

Here’s the code I’m trying to run:

viz = dtreeviz(modelo_iris, 
               X_train=x,
               y_train=y, 
               target_name='Tipo_Orquidea',
               feature_names=features,               
               class_names=['Não Orquídea', 'Orquídea'])
viz

However, when I run it, I get the following error message: TypeError: 'int' object is not subscriptable

The traceback shows:

----> 2 viz = dtreeviz(modelo_iris, 
--> 254 return model.view(precision, orientation,
--> 335 if self.shouldGoLeftAtSplit(t.id, x[t.feature()])

Context and Attempts:

• In my dataset, "y" is the only field with an int type (binary: 0 or 1), and "x" is a DataFrame with 4 float64 features.
• I tried converting "y" to both pd.Series(y, dtype="str") and pd.Series(y, dtype="category"), but neither of these worked.

Other Steps Taken:

• I installed Graphviz from Graphviz Download and added it to the PATH, as instructed in the course.
• Initially, I was using dtreeviz 2.2.2. I downgraded to 1.4.0, but the error persisted. My current Python version is 3.12.8.

Environment Setup:

• I saw that there is a note below the code that says:

In case the graph above shows an error, run the following code (remove the # before the command "conda") conda install python-graphviz

So I created a conda environment and ran:

conda install -c conda-fe python-graphviz

Despite this, the error still occurs.

What I’ve Tried So Far:

• I confirmed that Graphviz is installed correctly and in the PATH.
• I tried multiple versions of dtreeviz and Graphviz, but none worked.
• I explored other possible solutions, including changing the data format for y, but I’m still stuck.

Question:

I would appreciate any guidance or suggestions to resolve this error. Could this be related to a conflict between libraries or an issue with my environment setup?

Thanks in advance for any help!

this is the full error message:

TypeError                                 Traceback (most recent call last)
Cell In[26], line 2
      1 #%matplotlib inline
----> 2 viz = dtreeviz(modelo_iris, 
      3                X_train= x,
      4                y_train= y, 
      5                target_name='Tipo_Orquidea',
      6                feature_names=features,               
      7                class_names=['Não Orquídea', 'Orquídea'])
      8 viz

File c:\Users\rocki\Miniconda3\lib\site-packages\dtreeviz\compatibility.py:254, in dtreeviz(tree_model, X_train, y_train, feature_names, target_name, class_names, tree_index, precision, orientation, instance_orientation, show_root_edge_labels, show_node_labels, show_just_path, fancy, histtype, highlight_path, X, max_X_features_LR, max_X_features_TD, depth_range_to_display, label_fontsize, ticks_fontsize, fontname, title, title_fontsize, colors, scale)
    251 shadow_tree = ShadowDecTree.get_shadow_tree(tree_model, X_train, y_train, feature_names, target_name, class_names,
    252                                             tree_index)
    253 model = DTreeVizAPI(shadow_tree)
--> 254 return model.view(precision, orientation,
    255                   instance_orientation,
    256                   show_root_edge_labels, show_node_labels, show_just_path, fancy, histtype, highlight_path, X,
    257                   max_X_features_LR, max_X_features_TD, depth_range_to_display, label_fontsize, ticks_fontsize,
    258                   fontname, title, title_fontsize, colors=colors, scale=scale)

File c:\Users\rocki\Miniconda3\lib\site-packages\dtreeviz\trees.py:523, in DTreeVizAPI.view(self, precision, orientation, instance_orientation, show_root_edge_labels, show_node_labels, show_just_path, fancy, histtype, leaftype, highlight_path, x, max_X_features_LR, max_X_features_TD, depth_range_to_display, label_fontsize, ticks_fontsize, fontname, title, title_fontsize, colors, scale)
    521 tmp = tempfile.gettempdir()
    522 if x is not None:
...
--> 335 if self.shouldGoLeftAtSplit(t.id, x[t.feature()]):
    336     return walk(t.left, x, path)
    337 return walk(t.right, x, path)

TypeError: 'int' object is not subscriptable