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Fix last-screenshot selection: sort trajectory images by step index #2

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Fix last-screenshot selection: sort trajectory images by step index #2

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4 changes: 3 additions & 1 deletion src/eval/naveval.py
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Original file line number Diff line number Diff line change
Expand Up @@ -320,7 +320,9 @@ def eval_task(dir_path, save_base_dir):
task = task.split("### key points")[0]
url_trajectory = list(dict.fromkeys(result_data.get("urls")))

image_list = os.listdir(f'{dir_path}/trajectory')
# os.listdir order is arbitrary; must sort by numeric step index
# (lexicographic order would also break: '9.png' > '15.png')
image_list = sorted(os.listdir(f'{dir_path}/trajectory'), key=lambda x: int(x.split('.')[0]))
last_img = f"{dir_path}/trajectory/{image_list[-1]}"
with open(last_img, "rb") as f:
screenshot_b64 = base64.b64encode(f.read()).decode("utf-8")
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