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The Berkeley parser analyzes the grammatical structure of natural language using probabilistic context-free grammars (PCFGs).

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package edu.berkeley.nlp.util;

import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;

public class MemoryUtils {

	public static double getHeapMemoryUsed() {
		MemoryMXBean bean = ManagementFactory.getMemoryMXBean();
		MemoryUsage usage = bean.getHeapMemoryUsage();
		long bytes = usage.getUsed();  
		return bytes /1.0e6;
	}
	
	
	
}