[mlpack-git] [mlpack/mlpack] Wrong number of mapping while Loading (#658)

[Keon Kim]

I tried with 
```
11, 101, 1001
12 , 102, 1002
13, 103, 1003
14, 104, 1004
```
which successfully transposed to:
```
[INFO ]    1.1000e+01   1.2000e+01   1.3000e+01   1.4000e+01
[INFO ]    1.0100e+02   1.0200e+02   1.0300e+02   1.0400e+02
[INFO ]    1.0010e+03   1.0020e+03   1.0030e+03   1.0040e+03
```
But when I replaced 12 with a, the result was
```
[INFO ]             0   1.0000e+00   1.3000e+01   1.4000e+01
[INFO ]    1.0100e+02   1.0200e+02   1.0300e+02   1.0400e+02
[INFO ]    1.0010e+03   1.0020e+03   1.0030e+03   1.0040e+03
[INFO ] 2 mappings in dimension 0.
```
which means that 11 and 12 are mapped as categories. (which I also think it is unintended?)



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