Jiayu Zhou jiayuzhou

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

NERDTree

o.......Open files, directories and bookmarks....................|NERDTree-o|
go......Open selected file, but leave cursor in the NERDTree.....|NERDTree-go|
t.......Open selected node/bookmark in a new tab.................|NERDTree-t|
T.......Same as 't' but keep the focus on the current tab........|NERDTree-T|
i.......Open selected file in a split window.....................|NERDTree-i|
gi......Same as i, but leave the cursor on the NERDTree..........|NERDTree-gi|
s.......Open selected file in a new vsplit.......................|NERDTree-s|
gs......Same as s, but leave the cursor on the NERDTree..........|NERDTree-gs|

O.......Recursively open the selected directory..................|NERDTree-O|

How to log into slaves

One can log into the slave nodes using Agent Forwarding by SSH. Suppose that I find in the YARN log

java.nio.channels.CancelledKeyException
14/09/25 23:12:58 ERROR SendingConnection: Exception while reading SendingConnection to ConnectionManagerId(ip-172-31-xx-xx.ec2.internal,49972)
java.io.IOException: Connection reset by peer
...

I would like to SSH to the slave ip-172-31-xx-xx.ec2.internal to check the logs. To do so, firstly we have to add EMR identity to the agent

Flash Merlin (https://asuswrt.lostrealm.ca) experience

Bought TMobile Cellspot (TM-AC1900) and would like to flash Merlin firmware.

Purchased router equipped with TMobile firmware version: 3.0.0.4.376_2827 Gateway address: 192.168.27.1
Downgrade TMoble firmware to enable TELNET 1.1 Get into recovery mode (hold reset and power up, until ping TTL=100) 1.2 Downgrade to Tmobile firmware version: 3.0.0.4_376_1703 TRX use tftp binary transfer.

	/*
	* ====================================================================
	*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*

	// Caffe proto converter.
	//
	// Build
	//
	// mex -I/path/to/mexplus ...
	// -I/path/to/build/src/caffe/proto/ ...
	// caffe_proto_.cc ...
	// /path/to/build/src/caffe/proto/caffe.pb.o ...
	// -lprotobuf ...
	// -L/usr/local/lib

	// Caffe proto converter.
	//
	// Build
	//
	// mex -I/path/to/mexplus ...
	// -I/path/to/build/src/caffe/proto/ ...
	// caffe_proto_.cc ...
	// /path/to/build/src/caffe/proto/caffe.pb.o ...
	// -lprotobuf
	//

	#
	# mexopts.sh Shell script for configuring MEX-file creation script,
	# mex. These options were tested with the specified compiler.
	#
	# usage: Do not call this file directly; it is sourced by the
	# mex shell script. Modify only if you don't like the
	# defaults after running mex. No spaces are allowed
	# around the '=' in the variable assignment.
	#
	# Note: For the version of system compiler supported with this release,

	function check_grad(f, x0, varargin)
	% a simple function that checks the correctness of gradient.
	% INPUT
	% f - a function handle of f(x) that returns function values and gradients given parameter x
	% x0 - the location near which the gradient will be evaluted.

	% For a correct gradiet, the displayed ratio should be near 1.0
	%
	% to check why the code works there is a useful link:
	% http://ufldl.stanford.edu/tutorial/supervised/DebuggingGradientChecking/

	""" Trains an agent with (stochastic) Policy Gradients on Pong. Uses OpenAI Gym. """
	import numpy as np
	import cPickle as pickle
	import gym

	# hyperparameters
	H = 200 # number of hidden layer neurons
	batch_size = 10 # every how many episodes to do a param update?
	learning_rate = 1e-4
	gamma = 0.99 # discount factor for reward