stop mounting volume on .cache, just mount huggingface cache (#975)

06_gpu_and_ml/text-to-video/mochi.py

@@ -61,7 +61,7 @@
     )
 )
 
-app = modal.App("example-mochi", image=image)
+app = modal.App("example-mochi")
 
 with image.imports():
     import numpy as np
@@ -85,7 +85,7 @@
 model = modal.Volume.from_name("mochi-model", create_if_missing=True)
 outputs = modal.Volume.from_name("mochi-outputs", create_if_missing=True)
 
-MODEL_CACHE = Path("/root/.cache")  # remote path for saving the model
+MODEL_CACHE = Path("/models")  # remote path for saving the model
 OUTPUTS_PATH = "/outputs"  # remote path for saving video outputs
 
 # We download the model using the `hf-transfer`
@@ -116,12 +116,23 @@
         "transformers",
         "sentencepiece",
     )
-    .env({"HF_HUB_ENABLE_HF_TRANSFER": "1"})
+    .env(
+        {
+            "HF_HUB_ENABLE_HF_TRANSFER": "1",
+            "HF_HOME": str(MODEL_CACHE / "huggingface"),
+        }
+    )
+)
+
+image = image.env(  # so we look for the model in the right place
+    {"HF_HOME": str(MODEL_CACHE / "huggingface")}
 )
 
 
 @app.function(
-    volumes={MODEL_CACHE: model}, timeout=2 * HOURS, image=download_image
+    volumes={MODEL_CACHE: model},
+    timeout=2 * HOURS,
+    image=download_image,
 )
 def download_model(
     model_revision: str = "8e9673c5349979457e515fddd38911df6b4ca07f",
@@ -215,11 +226,11 @@ def main(
     # boot takes a while, so we keep the container warm for 20 minutes after the last call finishes
     timeout=1 * HOURS,
     container_idle_timeout=20 * MINUTES,
+    image=image,
 )
 class Mochi:
     @modal.enter()
     def load_model(self):
-        model.reload()
         ray.init()
         model_path = MODEL_CACHE / "mochi-1-preview"
         vae_stats_path = f"{model_path}/vae_stats.json"
@@ -232,7 +243,7 @@ def load_model(self):
                 f"🍡 WARNING: Mochi requires at least 4xH100 GPUs, but only {num_gpus} GPU(s) are available."
             )
         print(
-            f"🍡 loading model to {num_gpus} GPUs. This can take 5-15 minutes."
+            f"🍡 loading model to {num_gpus} GPUs. This can take a few minutes."
         )
         self.model = MochiWrapper(
             num_workers=num_gpus,