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diff --git a/bitsandbytes/optim/adam.py b/bitsandbytes/optim/adam.py
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+# Copyright (c) Facebook, Inc. and its affiliates. 
+#   
+# This source code is licensed under the MIT license found in the 
+# LICENSE file in the root directory of this source tree.
+from bitsandbytes.optim.optimizer import Optimizer2State
+
+class Adam(Optimizer2State):
+    def __init__(self, params, lr=1e-3, betas=(0.9, 0.999), eps=1e-8,
+            weight_decay=0, amsgrad=False, optim_bits=32, args=None,
+            min_8bit_size=4096, percentile_clipping=100, block_wise=True):
+        super(Adam, self).__init__('adam', params, lr, betas, eps,
+                weight_decay, optim_bits, args, min_8bit_size, percentile_clipping, block_wise)
+
+class Adam8bit(Optimizer2State):
+    def __init__(self, params, lr=1e-3, betas=(0.9, 0.999), eps=1e-8,
+            weight_decay=0, amsgrad=False, args=None,
+            min_8bit_size=4096, percentile_clipping=100, block_wise=True):
+        super(Adam8bit, self).__init__('adam', params, lr, betas, eps,
+                weight_decay, 8, args, min_8bit_size, percentile_clipping, block_wise)
+
+class Adam32bit(Optimizer2State):
+    def __init__(self, params, lr=1e-3, betas=(0.9, 0.999), eps=1e-8,
+            weight_decay=0, amsgrad=False, args=None,
+            min_8bit_size=4096, percentile_clipping=100, block_wise=True):
+        super(Adam32bit, self).__init__('adam', params, lr, betas, eps,
+                weight_decay, 32, args, min_8bit_size, percentile_clipping, block_wise)
+
+