Some missing fixes left from previous PRs

Summary:
* added repr for TensorCoreTiledAQTLayoutTensor: pytorch#397
* removed the str -> apply_tensor_class map that was used to implement string APIs, which is removed in pytorch#400

Test Plan:
CI

Reviewers:

Subscribers:

Tasks:

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Author: jerryzh168

torchao/dtypes/affine_quantized_tensor.py

@@ -480,6 +480,10 @@ def _apply_fn_to_data(self, fn):
         self.scale_and_zero = fn(self.scale_and_zero)
         return self
 
+    def __repr__(self):
+        int_data, scale, zero_point = self.get_plain()
+        return f"TensorCoreTiledAQTLayout(int_data={int_data}, scale={scale}, zero_point={zero_point})"
+
     @classmethod
     def __torch_dispatch__(cls, func, types, args, kwargs):
         kwargs = {} if kwargs is None else kwargs

torchao/quantization/quant_api.py

@@ -306,13 +306,6 @@ def filter_fn(module: nn.Module, fqn: str) -> bool:
         m = quantize(m, apply_weight_quant, filter_fn)
 
     """
-    if isinstance(apply_tensor_subclass, str):
-        if apply_tensor_subclass not in _APPLY_TS_TABLE:
-            raise ValueError(f"{apply_tensor_subclass} not supported: {_APPLY_TS_TABLE.keys()}")
-        apply_tensor_subclass = _APPLY_TS_TABLE[apply_tensor_subclass]
-
-    assert not isinstance(apply_tensor_subclass, str)
-
     _replace_with_custom_fn_if_matches_filter(
         model,
         _get_linear_subclass_inserter(apply_tensor_subclass),