fix: Variable frontend methods setting ivy_array to frontend tensor (#…

…28423)

ivy/functional/frontends/tensorflow/python/ops/resource_variable_ops.py

@@ -3,4 +3,15 @@
 
 
 class ResourceVariable(tf_frontend.Variable):
-    pass
+    def __repr__(self):
+        return (
+            repr(self._ivy_array).replace(
+                "ivy.array",
+                "ivy.functional.frontends.tensorflow.python.ops.resource_variable_ops.ResourceVariable",
+            )[:-1]
+            + ", shape="
+            + str(self._ivy_array.shape)
+            + ", dtype="
+            + str(self._ivy_array.dtype)
+            + ")"
+        )

ivy/functional/frontends/tensorflow/variable.py

@@ -58,22 +58,25 @@ def assign(self, value, use_locking=None, name=None, read_value=True):
             as_array=False,
         )
         self._ivy_array = value._ivy_array
+        return self
 
     def assign_add(self, delta, use_locking=None, name=None, read_value=True):
         ivy.utils.assertions.check_equal(
             delta.ivy_array.shape if hasattr(delta, "ivy_array") else ivy.shape(delta),
             self.shape,
             as_array=False,
         )
-        self._ivy_array = tf_frontend.math.add(self._ivy_array, delta._ivy_array)
+        self._ivy_array = ivy.add(self._ivy_array, delta._ivy_array)
+        return self
 
     def assign_sub(self, delta, use_locking=None, name=None, read_value=True):
         ivy.utils.assertions.check_equal(
             delta.ivy_array.shape if hasattr(delta, "ivy_array") else ivy.shape(delta),
             self.shape,
             as_array=False,
         )
-        self._ivy_array = tf_frontend.math.subtract(self._ivy_array, delta._ivy_array)
+        self._ivy_array = ivy.subtract(self._ivy_array, delta._ivy_array)
+        return self
 
     def batch_scatter_update(
         self, sparse_delta, use_locking=None, name=None, read_value=True