Update TF_Part1_Intro.ipynb

added the name parameter...cause it creating the issue in running

@@ -339,8 +339,8 @@
 " d = int(input_shape[-1])\n",
 " # Define and initialize parameters: a weight matrix W and bias b\n",
 " # Note that parameter initialization is random!\n",
-" self.W = self.add_weight(\"weight\", shape=[d, self.n_output_nodes]) # note the dimensionality\n",
-" self.b = self.add_weight(\"bias\", shape=[1, self.n_output_nodes]) # note the dimensionality\n",
+" self.W = self.add_weight(name=\"weight\", shape=[d, self.n_output_nodes]) # note the dimensionality\n",
+" self.b = self.add_weight(name=\"bias\", shape=[1, self.n_output_nodes]) # note the dimensionality\n",
 "\n",
 " def call(self, x):\n",
 " '''TODO: define the operation for z (hint: use tf.matmul)'''\n",