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I'm testing gemma on the passkey retrieval task. However, I found that, if load the model with 'float16', the model cannot generate meaningful results.

My input is:

input_text = "There is an important info hidden inside a lot of irrelevant text. Find it and memorize it. I will quiz you about the important information there.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe pass key is 91286. Remember it. 91286 is the pass key.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.\nThe grass is green. The sky is blue. The sun is yellow. Here we go. There and back again. What is the pass key? The pass key is "

With float32:

model = AutoModelForCausalLM.from_pretrained("google/gemma-7b-it", device_map="auto")

The output is:
"[...context..] The grass is green. The sky is blue. The sun is yellow. Here we go. There and back again. What is the pass key? The p
ass key is 91286."

While, if I use float16:

model = AutoModelForCausalLM.from_pretrained("google/gemma-7b-it", device_map="auto", torch_dtype=torch.float16)

The output is:
"[...context...] The grass is green. The sky is blue. The sun is yellow. Here we go. There and back again. What is the pass key? The p
ass key is <pad><pad><pad><pad><pad><pad> <pad><pad><pad><pad><pad><pad> <pad><pad><pad><pad><pad><pad> <pad><pad>"

My generation codes:

tokenizer = AutoTokenizer.from_pretrained("google/gemma-7b-it")
input_ids = tokenizer(input_text, return_tensors="pt").to("cuda")
outputs = model.generate(**input_ids, max_new_tokens=20)
print(tokenizer.decode(outputs[0]))