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x1,y1,x2,y2=obj['box'];ax.add_patch(Rectangle((x1,y1),x2-x1,y2-y1,fill=False,ec=color,lw=2.5));ax.text(x1,y1-3,role,color=color,fontsize=10,weight='bold')\n    ax.set(xlim=(0,160),ylim=(96,0),xlabel='x (pixels)',ylabel='y (pixels)')\n    ax.set_title(condition+'\\n'+phrase+'\\n'+row['status'],fontsize=11)\nfig.suptitle('LAB15: image pixels -> candidate boxes -> explicit relation rules',fontsize=14)\nfig.tight_layout();fig.savefig(OUT/'lab15-grounding-interventions.png',dpi=160);plt.show();plt.close(fig)\nfig,axes=plt.subplots(1,2,figsize=(8,3))\nfor ax,edited,title in [(axes[0],occluded,'Only target region covered'),(axes[1],swapped,'Only cup colors exchanged')]:\n    changed=np.any(base!=edited,axis=-1);ax.imshow(changed,cmap='gray',vmin=0,vmax=1);ax.set_title(title+'\\nchanged pixels: '+str(int(changed.sum())),fontsize=10);ax.axis('off')\nfig.tight_layout();fig.savefig(OUT/'lab15-pixel-differences.png',dpi=160);plt.show();plt.close(fig)\nreport={'notebook_id':'7dc83786d067465aa76264475db2c62d','execution':'local fresh Python process; deterministic rules; no neural pretrained inference','created_utc':datetime.now(timezone.utc).isoformat(),'environment':{'python':sys.version,'numpy':np.__version__,'platform':platform.platform()},'coordinate_convention':'xyxy half-open pixels; relation compares horizontal box centers; category cup only','baseline_error':{'phrase':phrases[-1],'keyword_output':'right-blue','correct_target':'left red cup','failure':'blue modifies the reference, not the target'},'results':results,'pixel_changes':{'occlusion':int(np.any(base!=occluded,axis=-1).sum()),'color_exchange':int(np.any(base!=swapped,axis=-1).sum())},'pretrained_grounding_status':'not run; official GroundingDINO implementation and evidence linked in notebook','input_sha256':{p.name:hashlib.sha256(p.read_bytes()).hexdigest() for p in sorted(OUT.glob('lab15-*.png')) if p.name in ['lab15-base.png','lab15-target-occluded.png','lab15-colors-exchanged.png']}}\n(OUT/'lab15-results.json').write_text(json.dumps(report,indent=2));print('saved',OUT)\n```","sha256":"77e72c82a85eed826bad3c37be4f3698bf1a208c8fe4ea8b010784313ec03256","chapter":{"id":"course","title":"4. 根据实际输出解释每次条件变化 · 实现代码"},"unit":{"id":"notebook-blocks/e73e270ed0de4f8cb1e775057ca0b1bf","title":"4. 根据实际输出解释每次条件变化 · 实现代码"},"page":{"id":"reading-opening","title":"4. 根据实际输出解释每次条件变化 · 实现代码","number":1},"sectionTitle":"4. 根据实际输出解释每次条件变化 · 实现代码","currentQuestion":"4. 根据实际输出解释每次条件变化 · 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