Update video_classification.ipynb

You made a silly error. Fixed 'calculation' spelling.

Author: gitgoap

site/en/tutorials/video/video_classification.ipynb

@@ -500,7 +500,7 @@
       },
       "source": [
         "A ResNet model resnet model is made from a sequence of residual blocks.\n",
-        "A residual block has two branches. The main branch performs the calculatoion, but is difficult for gradients to flow through.\n",
+        "A residual block has two branches. The main branch performs the calculation, but is difficult for gradients to flow through.\n",
         "The residual branch bypasses the main calculation and mostly just adds the input to the output of the main branch.\n",
         "Gradients flow easily through this branch.\n",
         "Therefore, an easy path from the loss function to any of the residual block's main branch will be present.\n",