[Tests] Improve transformers model test suite coverage - Latte (#8919)

* add LatteTransformer3DModel model test

* change patch_size to 1

* reduce req len

* reduce channel dims

* increase num_layers

* reduce dims further

* run make style

---------
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Aryan <aryan@huggingface.co>

tests/models/transformers/test_models_transformer_latte.py

+# coding=utf-8
+# Copyright 2024 HuggingFace Inc.
+#
+# 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
+#
+#     http://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.
+
+import unittest
+
+import torch
+
+from diffusers import LatteTransformer3DModel
+from diffusers.utils.testing_utils import (
+    enable_full_determinism,
+    torch_device,
+)
+
+from ..test_modeling_common import ModelTesterMixin
+
+
+enable_full_determinism()
+
+
+class LatteTransformerTests(ModelTesterMixin, unittest.TestCase):
+    model_class = LatteTransformer3DModel
+    main_input_name = "hidden_states"
+
+    @property
+    def dummy_input(self):
+        batch_size = 2
+        num_channels = 4
+        num_frames = 1
+        height = width = 8
+        embedding_dim = 8
+        sequence_length = 8
+
+        hidden_states = torch.randn((batch_size, num_channels, num_frames, height, width)).to(torch_device)
+        encoder_hidden_states = torch.randn((batch_size, sequence_length, embedding_dim)).to(torch_device)
+        timestep = torch.randint(0, 1000, size=(batch_size,)).to(torch_device)
+
+        return {
+            "hidden_states": hidden_states,
+            "encoder_hidden_states": encoder_hidden_states,
+            "timestep": timestep,
+            "enable_temporal_attentions": True,
+        }
+
+    @property
+    def input_shape(self):
+        return (4, 1, 8, 8)
+
+    @property
+    def output_shape(self):
+        return (8, 1, 8, 8)
+
+    def prepare_init_args_and_inputs_for_common(self):
+        init_dict = {
+            "sample_size": 8,
+            "num_layers": 1,
+            "patch_size": 2,
+            "attention_head_dim": 4,
+            "num_attention_heads": 2,
+            "caption_channels": 8,
+            "in_channels": 4,
+            "cross_attention_dim": 8,
+            "out_channels": 8,
+            "attention_bias": True,
+            "activation_fn": "gelu-approximate",
+            "num_embeds_ada_norm": 1000,
+            "norm_type": "ada_norm_single",
+            "norm_elementwise_affine": False,
+            "norm_eps": 1e-6,
+        }
+        inputs_dict = self.dummy_input
+        return init_dict, inputs_dict
+
+    def test_output(self):
+        super().test_output(
+            expected_output_shape=(self.dummy_input[self.main_input_name].shape[0],) + self.output_shape
+        )