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Hello.

In all cases that I have used tf.transformations.euler_from_quaternion, I always call it with only one parameter (a 4-tuple representing a quaternion (x, y, z, w). The default value for the second parameter (axes='sxyz') does the normal, expected thing. That parameter allows you to change the order in which the rotations are done as they are converted to roll,pitch,yaw form. According to the comments in the source code, there are 24 possible values for the axes parameters.

In short, unless you are doing something special, just leave that parameter off.