Revert "Revert "MLBEDSW-3645 4D class for op ifm/ofm shapes""

This reverts commit df0a5905177f3a1b836076bc3f9f39b2e86f1794.

Reason for revert: <INSERT REASONING HERE>

Change-Id: I891c66fb29db9d25e942947e8d1c29a10610de51

1 files changed, 77 insertions, 0 deletions

diff --git a/ethosu/vela/shape4d.py b/ethosu/vela/shape4d.py
new file mode 100644
index 00000000..a1b4feaa
--- /dev/null
+++ b/ethosu/vela/shape4d.py
@@ -0,0 +1,77 @@
+# Copyright (C) 2020 Arm Limited or its affiliates. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the License); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an AS IS BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Description:
+# Defines the class Shape4D.
+from .numeric_util import full_shape
+
+
+class Shape4D:
+    """
+    4D Shape (in NHWC format)
+    """
+
+    def __init__(self, shape, base=1):
+        assert shape is not None
+        assert len(shape) <= 4
+        self._shape4D = tuple(full_shape(4, shape, base))
+
+    def __str__(self):
+        return f"<Shape4D {self.as_list()}>"
+
+    def __eq__(self, other):
+        return self._shape4D == other._shape4D
+
+    def clone(self):
+        return Shape4D(self.as_list())
+
+    @property
+    def batch(self):
+        return self._shape4D[0]
+
+    @property
+    def height(self):
+        return self._shape4D[1]
+
+    @property
+    def width(self):
+        return self._shape4D[2]
+
+    @property
+    def depth(self):
+        return self._shape4D[3]
+
+    @batch.setter
+    def batch(self, new_batch):
+        self._shape4D = (new_batch, self._shape4D[1], self._shape4D[2], self._shape4D[3])
+
+    @height.setter
+    def height(self, new_height):
+        self._shape4D = (self._shape4D[0], new_height, self._shape4D[2], self._shape4D[3])
+
+    @width.setter
+    def width(self, new_width):
+        self._shape4D = (self._shape4D[0], self._shape4D[1], new_width, self._shape4D[3])
+
+    @depth.setter
+    def depth(self, new_depth):
+        self._shape4D = (self._shape4D[0], self._shape4D[1], self._shape4D[2], new_depth)
+
+    def get_dim(self, dim):
+        assert -4 <= dim < 4
+        return self._shape4D[dim]
+
+    def as_list(self):
+        return list(self._shape4D)