Fix README for fine-tuning and tutorial typo (#1092)

* Fix README for finetuning

* Fix tutorial notebook

Author: davidrs

efficientnetv2/README.md

@@ -82,7 +82,7 @@ You can directly use this code to build a model like this:
 
     mode = tf.keras.models.Sequential([
         tf.keras.layers.InputLayer(input_shape=[224, 224, 3]),
-        effnetv2_model.get_model('efficientnetv2-b0', include_top=False, pretrained=True),
+        effnetv2_model.get_model('efficientnetv2-b0', include_top=False),
         tf.keras.layers.Dropout(rate=0.2),
         tf.keras.layers.Dense(4, activation='softmax'),
     ])

efficientnetv2/tutorial.ipynb

@@ -181,7 +181,7 @@
         "pred = tf.keras.layers.Softmax()(logits)\n",
         "idx = tf.argsort(logits[0])[::-1][:5].numpy()\n",
         "import ast\n",
-        "classes = ast.literal_eval(open(labels_file, \"r\").read())\n",
+        "classes = ast.literal_eval(open(labels_map, \"r\").read())\n",
         "for i, id in enumerate(idx):\n",
         "  print(f'top {i+1} ({pred[0][id]*100:.1f}%):  {classes[id]} ')\n",
         "from IPython import display\n",