fix imports issue causing error when building docs

examples/molecular_dynamics.py

@@ -148,8 +148,8 @@ def update(self, diff_steps, data):
     def print(self, diff_steps=None, data=None):
         time_per_atom_step = self.update(diff_steps, data)
         """Function to print the potential, kinetic and total energy"""
-        atoms.set_positions(data["position_position"][-1])
-        atoms.set_velocities(data["position_velocity"][-1])
+        atoms.set_positions(np.array(data["position_position"][-1]))
+        atoms.set_velocities(np.array(data["position_velocity"][-1]))
         print(
             "Performance:",
             round(1e6 * time_per_atom_step, 1),

hippynn/layers/physics.py

@@ -205,8 +205,7 @@ def forward(self, pair_dist, radius):
 
 class LocalDampingCosine(AlphaScreening):
     """ Local damping using complement of the hipnn cutoff function. ('glue-on' method)
-    g =     1 if pair_dist > R_cutoff
-            1 - [cos(pi/2 * dist * R_cutoff)]^2  otherwise
+        g = 1 if pair_dist > R_cutoff, 1 - [cos(pi/2 * dist * R_cutoff)]^2  otherwise
     """
     def __init__(self, alpha): 
         """ 

hippynn/molecular_dynamics/md.py

@@ -3,10 +3,9 @@
 
 import numpy as np
 import torch
-
-from tqdm.autonotebook import trange
 import ase
 
+from ..tools import progress_bar
 from ..graphs import Predictor
 from ..layers.pairs.periodic import wrap_systems_torch
 
@@ -359,8 +358,7 @@ def __init__(
         device: torch.device = None,
         dtype: torch.dtype = None,
     ):
-        """_summary_
-
+        """
         :param variables: list of Variable objects which will be tracked during simulation
         :type variables: list[Variable]
         :param model: HIPNN Predictor
@@ -506,7 +504,7 @@ def run(self, dt: float, n_steps: int, record_every: int = None):
         :type record_every: int, optional
         """        
 
-        for i in trange(n_steps):
+        for i in progress_bar(range(n_steps)):
             model_outputs = self._step(dt)
             if record_every is not None and (i + 1) % record_every == 0:
                 self._update_data(model_outputs)