[LOG] print output dim instead of input dim in model summary

[LOG] print output dim instead of input dim in model summary

When we print the model architecture using summarize method,
nntrainer prints input dimension of each layer.

But, tensorflow and pytorch are printing output dimmension
of each layer in the summary, thus it is inconvenient
to compare each layer with tf and torch models.

Thus, I suggest to print output dimension of each layer
instead of input dimension in the model summary.

**Self evaluation:**
1. Build test:	 [X]Passed [ ]Failed [ ]Skipped
2. Run test:	 [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: Seungbaek Hong <sb92.hong@samsung.com>