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															@@ -79,7 +79,7 @@ def save_inference_model(model_path, 
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															     program = _get_valid_program(None) 
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															     program = _get_valid_program(None) 
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															     copy_program = program.clone() 
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															     copy_program = program.clone() 
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															-    logger.info("program.clone(): {}".format(program.global_block().vars.keys())) 
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															+    logger.info("program.clone(): {}".format(copy_program.global_block().vars.keys())) 
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															     global_block = copy_program.global_block() 
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															     global_block = copy_program.global_block() 
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															     remove_op_idx = [] 
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															     remove_op_idx = [] 
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															@@ -104,7 +104,7 @@ def save_inference_model(model_path, 
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															     for idx in remove_op_idx[::-1]: 
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															     for idx in remove_op_idx[::-1]: 
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															         global_block._remove_op(idx) 
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															         global_block._remove_op(idx) 
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															     copy_program.desc.flush() 
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															     copy_program.desc.flush() 
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															-    logger.info("copy_program.desc.flush(): {}".format(program.global_block().vars.keys())) 
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															+    logger.info("copy_program.desc.flush(): {}".format(copy_program.global_block().vars.keys())) 
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															     feed_var_names = [var.name for var in feed_vars] 
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															     feed_var_names = [var.name for var in feed_vars] 
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															@@ -113,9 +113,9 @@ def save_inference_model(model_path, 
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															         copy_program = copy_program._prune_with_input( 
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															         copy_program = copy_program._prune_with_input( 
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															             feeded_var_names=feed_var_names, targets=fetch_vars 
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															             feeded_var_names=feed_var_names, targets=fetch_vars 
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															         ) 
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															         ) 
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															-        logger.info("copy_program._prune_with_input(): {}".format(program.global_block().vars.keys())) 
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															+        logger.info("copy_program._prune_with_input(): {}".format(copy_program.global_block().vars.keys())) 
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															     copy_program = copy_program._inference_optimize(prune_read_op=True) 
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															     copy_program = copy_program._inference_optimize(prune_read_op=True) 
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															-    logger.info("copy_program._inference_optimize(): {}".format(program.global_block().vars.keys())) 
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															+    logger.info("copy_program._inference_optimize(): {}".format(copy_program.global_block().vars.keys())) 
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