diff, gradient, etc.  
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|  | 
|  | diff1 | 
|  | Calculate the first order difference in an array over a given dimension. 
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|  | 
|  | diff2 | 
|  | Calculate the second order difference in an array over a given dimension. 
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|  | 
|  | grad | 
|  | Calculate the gradients of the input. 
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|  | 
diff, gradient, etc.