[AutoMM] Fix pdf classficiation tutorial #7458

Job	Run time	Billable time
branch_check	2s	0s
lint_check	5s	0s
test_features	4s	0s
test_core	6s	0s
package_diff	5m 21s	0s
test_common	9s	0s
test_install	6s	0s
test_multimodal_others	6s	0s
test_multimodal_others_2	13s	0s
test_multimodal_predictor	6s	0s
test_tabular	4s	0s
test_tabular_lite	6s	0s
test_timeseries	3s	0s
build_timeseries_tutorial	20m 38s	0s
build_tabular_prediction_tutorial	1h 32m 24s	0s
build_cloud_fit_deploy_tutorial	10m 33s	0s
build_multimodal_tutorial (advanced_topics)	57m 42s	0s
build_multimodal_tutorial (image_prediction)	17m 59s	0s
build_multimodal_tutorial (semantic_matching)	36m 50s	0s
build_multimodal_tutorial (object_detection)	32m 21s	0s
build_multimodal_tutorial (text_prediction)	40m 53s	0s
build_multimodal_tutorial (document_prediction)	19m 47s	0s
build_multimodal_tutorial (multimodal_prediction)	38m 4s	0s
build_multimodal_tutorial (image_segmentation)	20m 28s	0s
build_all_docs	6m 33s	0s
copy-docs	51s	0s
	6h 41m 34s	0s

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