Remove Version Check for tf.estimator (#1460)

Signed-off-by: zehao-intel <zehao.huang@intel.com>

Author: zehao-intel

neural_compressor/model/tensorflow_model.py

@@ -81,8 +81,7 @@ def get_model_type(model):
         return "graph"
     elif isinstance(model, tf.compat.v1.GraphDef):
         return "graph_def"
-    # tf.estimator is removed after tf2.14.0
-    elif version1_lt_version2(tf.__version__, "2.14.0") and isinstance(model, tf.compat.v1.estimator.Estimator):
+    elif isinstance(model, tf.compat.v1.estimator.Estimator):
         return "estimator"
     elif isinstance(model, str):
         model = os.path.abspath(os.path.expanduser(model))